By THE ASSOCIATED PRESS
Published: October 19, 2008

CHARLESTON, S.C. (AP) — It has long been a mystery why the H. L. Hunley never returned after becoming the first submarine to sink an enemy warship in 1864, but research announced Friday may lend credence to one of the theories.

Scientists have found that the eight-man crew of the hand-cranked Confederate submarine had not set the pump to remove water from the crew compartment, which might indicate it was not being flooded.

That could mean crew members suffocated as they used up air, perhaps while waiting for the tide to turn and the current to help take them back to land.

The new evidence disputes the notion that the Hunley was damaged and took on water after ramming a spar with a charge of black powder into the Union blockade ship Housatonic.

The submarine, found in 1995 and raised five years later, had a complex pumping system that could be switched to remove water or operate ballast tanks used to submerge and surface.

Thanks to William Vosseler of the PhilaCWJournal for sending this in.

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