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TM 55-1915-200-SDC
described in the Trim and Stability Booklet to ensure that a safe amount of reserve buoyancy remains.
If an underwater weapon (mine or torpedo) is fuzed to explode on contact with the ship's hull, a hole is torn in the
shell and the interior of the ship is subjected to blast and fragment attack, followed by a violent inrush of water.
Surrounded by a liquid medium, underwater weapons do not depend upon their casing for fragment attack, but instead,
tear loose large chunks of the ship's structure and hurl them into the ship with projectile-like violence.
Wiring circuits may be severed by blasts and fragments. Severed and grounded cables will interrupt power in
the immediate vicinity and can short the entire electrical system. If the damaged area is aft, machinery spaces can be
flooded. The power plant can be affected; possibly all propulsion will be lost.
Underwater damage depends mainly on the weight of the bursting charge. Because of the large amounts of
explosive used in modern mines and torpedoes, the holes opened in the shell of the ship by these weapons will be very
Flame from incandescent gases created by explosion, unless dampened by liquids, can spread through the
affected area. Hot fragments can also start fires in remote areas. Acrid smoke and toxic gases from explosion and fire
will necessitate the use of oxygen breathing apparatus.
When a vessel sustains underwater damage, violent shock may break or derange delicate radio, radar or
navigation equipment. Brittle materials such as valve bodies or cast-iron base plates under machinery can be fractured
even at considerable distances from the damaged area. Shock frequently opens circuit breakers. Violent heaving of
decks can cause personnel injury, particularly to those who are standing at the time of impact.
WATERTIGHT SPACES. Watertight integrity below the main deck of the LSV is provided by the installation,
during construction, of athwartships bulkheads at frames 10, 25, 52, 84, and 114.
At or above the main deck, compartments are protected by watertight doors as follows: At the main deck level,
watertight doors forward protect the ladders, port and starboard, to the bow thruster compartment, the deck storeroom,
and the paint locker.
Port side main deck watertight doors lead to the passageway, the boatswain storeroom, and the damage control
Starboard side main deck watertight doors lead to the passageway, machinery room, and the emergency
generator room.


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