According to Romancing Miss Stone, Alvin says that his birthday is nearby and he is turning nine years old (along with his brothers). However, later on in the series, they are stated to be eight years old several times, despite being 4th graders.

Alvin was introduced in the Middle Ages based on surnames which were in turn derived from the Old English names Æthelwine and Ealdwine. The names mean “noble friend” and “old friend” respectively.

He has been a fisheries scientist with the Massachusetts Division of Marine Fisheries since 1987 and currently heads up the Massachusetts Shark Research Program.

ten hours

A typical eight-hour dive takes two scientists and a pilot as deep as 4,500 meters (14,764 feet), a depth capability that encompasses 86 percent of the seafloor….

Alvin (DSV-2) is a manned deep-ocean research submersible owned by the United States Navy and operated by the Woods Hole Oceanographic Institution (WHOI) in Woods Hole, Massachusetts….DSV Alvin.

Scientists discovered the hot-springs ecosystems with the help of Alvin, the world’s first deep-sea submersible. Alvin has an operational maximum depth of about 4,000 m, more than four times greater than that of the deepest diving military submarine.

Nereus

4,500 meters

Today, scientists have access to a wide range of technologies that routinely carry them down to 4,500 meters (14,764 feet) and enable them to study the deepest parts of the ocean. Human occupied vehicles (HOVs), like the Alvin, transport up to three people directly to the seafloor.

A nuclear submarine can dive to a depth of about 300m. This one is larger than the research vessel Atlantis and has a crew of 134. The average depth of the Caribbean Sea is 2,200 meters, or about 1.3 miles. The average depth of the world’s oceans is 3,790 meters, or 12,400 feet, or 2 1⁄3 miles.

In short: most of the body can handle any pressure, but if we’re breathing air the maximum safe depth is about 60 meters (190 feet), the feasible maximum with current technical capabilities (and special breathing gases) is about 500 meters (but, for safety reasons, those depths have only been simulated).

The Navy announced today a ban on smoking aboard submarines while they are deployed below the surface after medical testing showed non-smokers suffered effects of second-hand smoke. As with other branches of the military, smoking has long been a staple of Navy culture.

Farting is possible while scuba diving but not advisable because: An underwater fart will shoot you up to the surface like a missile which can cause decompression sickness. The acoustic wave of the underwater fart explosion can disorient your fellow divers.

You can you survive 47 metres underwater but to do so you need to have the necessary training and experience as a scuba diver. To survive a deep dive to 47 metres down you must follow decompression stop limits or carry out decompression stops on your ascent to avoid getting decompression sickness.

How Deep Can a Human Dive Before Being Crushed? There is no fixed depth where we can say for sure that a diver will be crushed once they cross a certain depth. Most recreational divers don’t generally go beyond 130 feet, but commercial divers manage to reach depths of 2,000 feet with the help of atmospheric suits.

No, you cannot scuba dive to the Titanic. The Titanic lies in 12,500 feet of ice cold Atlantic ocean and the maximum depth a human can scuba dive is between 400 to 1000 feet because of water pressure. The increasing water pressure also restricts blood flow by constricting tissue.

Human beings can withstand 3 to 4 atmospheres of pressure, or 43.5 to 58 psi. Water weighs 64 pounds per cubic foot, or one atmosphere per 33 feet of depth, and presses in from all sides. The ocean’s pressure can indeed crush you.

35,858 feet

Decompression sickness: Often called “the bends,” decompression sickness happens when a scuba diver ascends too quickly. But if a diver rises too quickly, the nitrogen forms bubbles in the body. This can cause tissue and nerve damage. In extreme cases, it can cause paralysis or death if the bubbles are in the brain.

For every 33 feet a diver descends the weight of the water above them increases by 15 pounds per square inch. At only a few feet below the surface, the water pressure is already too great for the muscles that expand and contract our lungs to work, making it extremely difficult for us to draw breath.

Setting a new Guinness World Record for the deepest scuba dive, the man dove more than 1,000 feet (305 meters) below the surface of the Red Sea. Most recreational scuba divers only dive as deep as 130 feet (40 meters), according to the Professional Association of Diving Instructors.

100-130 feet

If you’ve scuba dived before, then you’ve definitely heard about decompression sickness or “the bends.” When divers ascend too quickly from deep waters, dissolved nitrogen in the blood forms bubbles which can cause excruciating pain in the muscles, paralysis, and in some cases even death.

The deepest dive on record is 1,082 feet (332 meters) set by Ahmed Gabr in 2014. That depth is the equivalent to approximately 10 NBA basketball courts aligned vertically. In terms of pressure, that’s about 485 pounds per square inch.