John Marvin

Shipwreck John Marvin
Type:
shipwreck, clam dredge, USA
Built:
1951, RTC Shipbuilding, Camden NJ, USA, as Maidstone
Specs:
( 120 ft ) 227 gross tons, 5 crew
Sunk:
Thursday January 16, 1992; winter storm - no casualties
Depth:
70 ft

The John Marvin sank in the same storm as the Valerie E off Long Island. The storm was a surprise "Nor'easter" ( as the TV weathermen are so fond of calling everything nowadays ) that dumped a pile of snow on the region, caused considerable flooding, and quickly raised ten-foot-plus seas, catching the fishing fleet off-guard and scrambling for safe harbors. Not all of them made it.

The Coast Guard got the John Marvin's entire crew off safely just minutes before the vessel went down. With no casualties, no search, and no mystery, the incident scarcely even made the news - merely a footnote in a report on the Valerie E; and the vessel not even named, in the Asbury Park Press.

Shipwreck John Marvin
Shipwreck John Marvin
Close-up of the wheelhouse
Shipwreck John Marvin
Shipwreck John Marvin
Shipwreck John Marvin

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Here is a description of recreational dive planning. The purpose here is to demonstrate basic dive planning and use of Dive Tables for non-divers who are interested in becoming certified but are worried about the complexities and math involved. Learning to use dive tables is usually the single most daunting classroom task for a student diver. It's really not all that hard.

The purpose of dive planning is to manage the Nitrogen gas that is absorbed into the tissues of your body while breathing air at higher-than-normal pressures underwater. If you absorb too much Nitrogen at depth and then ascend to normal atmospheric pressure, the gas will form bubbles in your blood and tissues. This is called Decompression Sickness, commonly known as "the bends." Decompression Sickness can vary in severity from barely noticeable to fatal, depending on your dive profile and other factors. The goal of no-decompression dive planning is to plan your dives in advance so that under no circumstances* can ascending to the surface result in Decompression Sickness.

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