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.