Category Archives: diving metal detectors

FREE – Underwater Search Newsletter

FREE – Underwater Search Newsletter

Learn where a sunken ship carrying millions in treasure was uncovered, or how a missing WWII aircraft was found, or what equipment is being used to make our ports and harbors more secure. Get Search Team News and you’ll know who’s using sophisticated underwater search equipment to find everything from Spanish galleons to underwater explosives. The newsletter features articles on underwater search operations from around the world. Read about the technology and techniques being employed by professional treasure hunters, commercial diving companies, law enforcement agencies, and military units.

Keep your search team up to date with this informative newsletter.                   There are sections on Commercial News, International News, and Law Enforcement & Dive Rescue News.                   Find out how underwater cameras are helping engineers make critical decisions about the repair and maintenance of submerged structures from hydroelectric dams to the hulls of ships. See how ROVs and sonar systems assist in environmental studies and what they are doing for the aquaculture industry.                     Stay informed on the new tools being used by law enforcement agencies to strengthen homeland defense and learn how underwater metal detectors help police put more criminals behind bars. Discover which government agencies are performing underwater search operations and why.   Learn about the business of underwater salvage and find out how to make money finding what other’s loose.

Another popular section of the newsletter is Treasures Recovered!                   It includes everything from the search and recovery of a lost diamond ring to complete articles on the salvage of ancient treasure ships. You’ll be amazed at the variety and quantity of “treasures” pulled from rivers, lakes, and oceans around the globe.



One of the problems in towing an instrument underwater, is the long length of cable required to get the device down to depth.  A typical ratio of cable length to tow depth is 4 to 1, which means 400 feet of cable is  required to tow at a depth of 100 feet.  Increase the tow speed and even more cable is needed to get to depth.  To overcome this problem a depressor wing is used.  With the wing, the ratio is cut in half which means the equipment can be towed at a depth of 100 feet using only 200 feet of cable.  The advantage is obvious; no more piles of cable on the boat deck and smaller, less expensive cable handling systems can be used.       In the past, many of these depressors were custom made to fit specific equipment.  This meant the wings were expensive and had limited applications.  JW Fishers saw the solution to these problems as a universal wing that could be used with any type of equipment, and developed the DDW-1 deep dive wing.  The DDW is assisting a variety of users from government agencies and universities, to police departments and marine service companies.  The list of government groups using the wing is extensive and includes the U.S. National Marine Fisheries Service, the Argentine Navy, and the Maritime Administration of Latvia.  Institutions of higher education employing this device are as geographically diverse as their applications for the wing.  They extend from the Univeristy of South Carolina to University of Alaska.  The collection of marine services companies using the DDW-1 cover a broad spectrum, from giants like Ireland’s Korec Group to privately owned civil engineering companies like Isreal’s Merterre.      Taking advantage of the wing’s diving ability is a broad range of equipment in a variety of applications.   The Fisheries Service is using their wing in conjunction with the TOV-1 towed underwater camera system to survey reefs and other marine ecosystems.  The Office of Emergency Services in Fairfield, California and the Buffalo Police Dept. in New York also operate a towed camera with the DDW-1.  They use it to search for deep water drowning victims.  The Argentine Navy and Varna Diving Company in Bulgaria both use their wings with a proton magnetometer to search for sunken vessels.   Sources Equipment LLC in the United Arab Emirates also use the DDW with a proton mag, but their primary mission is to locate and track oil pipelines.  A number of law enforcement agencies are using the depressor wing with the side scan sonars to search for drowning victims, submerged vehicles, and capsized boats.  These departments include the Allegan County Sheriff in Michigan and Suffolk County Police on Long Island.       One of the most interesting projects involving the deep dive wing is the search for a historic shipwreck being undertaken on the north east coast of England.   A consortium made up of members from the Filey Town Council and the Filey Underwater Research unit are using the wing with an underwater metal detector in a hunt for the remains of the Bonhomme Richard.  Commodore John Paul Jones of the American Continental Navy fought a battle from this vessel which has been described as “a brilliant action at sea of classic proportions”.

underwater search newsletter


Underwater Search Newsletter

JW Fishers has increased the size and scope of its popular newsletter Search Team News.   The publication includes numerous articles on underwater search operations performed by government agencies, commercial divers, law enforcement agencies, and military units from around the world. One section of the newsletter titled “Law Enforcement and Dive Rescue News” describes the use of metal detectors, underwater cameras, and side scan sonars by police, fire, and dive rescue units.                 Another section describes the type of operations performed by universities and government agencies using underwater search equipment.                 In the “Commercial News” section, the work of commercial diving and marine services companies is detailed.                 Their projects include tracking underwater pipes and cables, locating lost ship anchors, and inspecting underwater structures like dams and bridge supports.

One of the most widely read parts of the newsletter is “Treasures Recovered”.                   Here are the exciting stories about recovering silver bars from sunken Spanish galleons and finding priceless artifacts in the remains of ancient sailing vessels.                   The articles range from the projects of professional treasure hunters searching for pirate booty, to the hunts of weekend divers looking for lost rings and coins.                 Many of these “treasure hunts” take place on beaches and dive sites close to your own hometown, while others are in exotic places half way round the world.

There is also a section titled “International News” that chronicles the underwater work of overseas companies and foreign governments. There are short excerpts describing who is using which type of equipment for what kind of projects, like how a power company in Ireland is using of an underwater camera system or why a government agency in Thailand is using a side scan sonar system.

The back page of the newsletter has all the latest company news from JW Fishers,                 information on the newest products and technology for underwater search operations, and contact info to submit a story or to get more information on one of the articles.                 There is also a “Customer Feedback” column where e-mails and letters from customers are printed.

The most recent issue of the newsletter includes articles about; a power company saving millions with the help of an ROV, the discovery of a “virgin” treasure wreck in Canadian waters, and how a mystery involving one of this country’s deepest lakes was solved with an underwater camera.

New light system for underwater camera

New light system for underwater camera

JW Fishers has developed an external light system for their popular MC-1 mini camera.   The compact underwater camera is ideal for use where low cost or small size is critical. The new light system provides high intensity lighting to optimize picture quality. One or two lights can be attached directly to the camera housing with a specially designed, easy to remove bracket.                 The lights are available with either 100 or 250 watt quartz halogen bulbs and are water cooled to ensure long bulb life. Power is supplied from the surface allowing unlimited operating time.                 The standard mini camera system includes a 500 foot depth rated underwater housing with black & white camera and 150 feet of umbilical cable. The camera sends live video through the cable to the surface for viewing and recording. Any TV or video monitor can be connected to view the clear, sharp video images produced by the underwater camera.

The mini camera and lights are ideal for any type of underwater inspection operation.                   The 6 inch long, 2 inch diameter camera housing can easily be mounted to a diver’s helmet or lowered into a pipe for internal inspections. An internal ring light with high intensity LEDs provides the lighting when performing internal pipe inspections with the mini cam.   The MC-1 is currently in use by commercial diving companies worldwide giving topside tenders and supervisors with their own view of the worksite. The mini camera is also being used by law enforcement agencies and military units to search for evidence or explosives, and to survey underwater sites before deploying divers.                 Other applications for the system include inspection of seawalls and shiphulls by attaching the housing to a long pole handle and maneuvering it from the surface.                   Two east coast companies recently reported new and unique uses for this mini underwater camera. A Rhode Island company that manufactures sediment sampling devices attached an MC-1 to their equipment so the operator could view the area being sampled, and a dredging company in Florida attached the camera to their equipment allowing the operator to view the bottom before and after dredging operations.

A number of options are available for the MC-1 system including cable lengths up to 1,000 feet and color or PAL (European) format cameras.                 The color camera is a great option for those applications where a color picture is important such as viewing benthic habitats. The mini camera’s housing, lights, and brackets are all constructed of corrosion-proof PVC and urethane to give years of trouble free performance.

Fishers light up your underwater world

Fishers light up your underwater world

Known for their extensive line of underwater search equipment, JW Fishers has expanded the product line with the introduction of a new underwater light system. For over 10 years the company has produced underwater lights for use on their ROVs and other underwater cameras. As a result of customer demand, the lights are now being offered separately. Two different light systems are available, the DHL-1 dual underwater light and the SL-1 single underwater light. Both lights are ideal for any of the numerous underwater inspection projects encountered by today’s commercial and professional divers, including hull, dam, and bridge inspections.

The DHL-1 features two side by side lamps mounted in a holder with attached handle for ease of use by divers. The SL-1 is a single lamp which can be attached to a diver’s helmet or mounted on any underwater structure. Several single lamps can be ganged together in an array for lighting large areas. The light beam is provided by high intensity quartz halogen bulbs that are water cooled, ensuring long bulb life. Both lights are available with either 100 or 250 watt bulbs. The SL-1 and DHL-1 are surface powered by either 120 volts ac or 12 volts dc which allows them to supply continuous lighting for extended underwater operations. A 150 foot cable with abrasion resistant jacket is included with the light, and cable lengths up to 1,000 feet can be supplied. The lights have slightly negative buoyancy and weigh only a few ounces in the water.

Fishers underwater lights are economically priced with the base cost of the SL-1 system at $395 and the DHL-1 at $695. These underwater lights have a depth rating of 1,000 feet and are constructed of high impact, corrosion proof PVC and urethane to provide years of trouble-free performance. Both are covered by a two year warranty.

Just over a year ago JW Fishers introduced their new DDW-1 deep dive wing

Fisher’s Deep Dive Wing makes a Splash!

Just over a year ago JW Fishers introduced their new DDW-1 deep dive wing. The wing is designed to be attached to any towed underwater instrument and make it dive deeper using less cable. Ideally suited for use with side scan sonars, magnetometers, and underwater cameras it has gained wide acceptance in the underwater search and survey industry. Since it’s inception the DDW-1 has become enormously popular with a variety of different users.

A Florida marine services company, Resolve Marine, is using their deep dive wing with a magnetometer and towed underwater camera system to locate WWII submarine detection cables. Researchers at the University of Alaska have attached an underwater camera to their DDW-1 to perform foraging studies on several whale species. University spokesperson Briana Witteveen says, “One application for the system is to help determine prey types”. The Chevron oil company is using their wing with a Proton 4 mag to locate and track pipelines in Nigerian waters before drilling new wells. A dive shop owner in Holland, Michigan searches for shipwrecks and other objects lost in the great lakes with his side scan sonar and deep dive wing. A group of Florida treasure hunters bought a wing to use with several of their towed instrument packages including underwater metal detectors. Connecticut based Counterpoint Marine has their DDW-1 attached to a boat-towed metal detector to assist in searching for anchors, moorings, pipelines, and a variety of other targets. The Department of Fire Services in Hong Kong uses a side scan sonar and deep dive wing for search and rescue operations. “The wing helps us get the sonar down deep, beyond the range we can search with our divers”, says the department’s Terry Tsui.

The compact size and 45 pound weight of the DDW-1 make it easy to deploy from any size search vessel. The wing’s high weight to pull ratio creates a significant downward force which maximizes the depth of the towed instrument using a minimal amount of cable. Best of all is the deep dive wing’s PVC and stainless steel constuction that make it impervious to salt water and corrosion.