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When it left San Francisco on March 25, 1921, Conestoga was en route to Tutuila, American Samoa via Pearl Harbor, Hawaii. When Conestoga failed to reach Hawaii by its anticipated arrival date the Navy mounted a massive air and sea search around the Hawaiian Islands, the tug's destination. Unable to locate the ship or wreckage, the Navy declared Conestoga and its crew lost on June 30, 1921, the last U.S. Navy ship to be lost in peacetime without a trace.

A difficulty in obtaining information about the natural behaviour of wild animals is that detailed observations of the activities of different individuals is necessary over long periods of time, and this is especially hard to achieve with sharks.

The wreck, which has been confirmed to be that of 300-year-old frigate Huis te Warmelo was found at a depth of 64 metres near Helsinki. The vessel was once part of the Dutch navy, specifically a region known as West Frisia. The ship was identified on the basis of hull dimensions, location, structure and armament.

The film - which took five years to make - discovers a superb conservation success story, where sharks are considered sacred.

Vasco da Gama was the first European to reach India by sea, linking Europe and Asia for the first time by ocean route, as well as linking the Atlantic and the Indian oceans entirely and definitively, and in this way, the West and the Orient. This was accomplished on his first voyage to India (1497–1499)

The ship, which sank in a storm in May 1503 off the coast of Al Hallaniyah island in Oman's Dhofar region, is the earliest ship from Europe's Age of Discovery ever to be found and scientfically investigated by a team of archaeologists and other experts.

From Churchill's blockships dotted along the rugged coastline, to dramatic battleships, the wrecks of Scapa Flow continue to fascinate and enthrall divers.

Sand tiger sharks, top predators that live in coastal waters off the Eastern United States, have experienced drastic population declines over the past several decades. Understanding how these sharks move and interact could help biologists better conserve this species and determine how vulnerable they are to human activities. During summer, the sharks congregate in the shallow waters of Delaware Bay but are highly migratory, travelling as far south as the Carolinas and Florida during the winter and early spring.

The goal of the Union blockade was to keep supplies from reaching the Confederacy through one of its most important ports and to prevent the export of cotton and other marketable items by the Southerners.

Archaeologists discovered the shipwreck 44 km (27 miles) downstream from Wilmington near Fort Caswell, at the mouth of Cape Fear River — making it the first Civil War shipwreck uncovered in the region in decades, said Billy Ray Morris, deputy state maritime archaeologist and director of the North Carolina Office of State Archaeology's Underwater Archaeology Branch.

The purpose of EN250:2000 was to ensure a minimum level of safe operation for 'Open Circuit Self Contained Compressed Air Diving Apparatus' down to a maximum depth of 50 metres / 164 feet. This European Standard also specified that regulators must be independently tested to ensure they meet these minimum requirements.

Stating the design criteria

Manufacturers and consumers alike expect regulators to perform to certain specifications. If you purchase a travel regulator, you expect it to deliver good performance under the conditions it was created for - in warmer water.

Bull shark diving is becoming a popular tourist activity in the waters around Cancun, Playa del Carmen and Cozumel.

Be quiet

Luis Lombardo Cifuentes, director of Saving Our Sharks, told the Riviera Maya News they have noticed the sharks displaying fearful behaviour this year and are asking divers to use extreme caution when approaching them by being very quiet and not make noise in the water.

This year the annual New Jersey scuba diving show celebrates a major milestone. It was founded in 1976, making this the 40th year BTS has recognised divers in the fields of the arts, education, environment, service and science.

2016 DIVER OF THE YEAR

Environment - Wendy Benchley

Diving Pioneer - Captain Wayne Hasson

Science - Dr Richard A. Lutz

Service - Dr Drew Richardson

Education - Bill Ziefle