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 TM 55-1905-223-SDC
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 large.
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.
2-4.
WATERTIGHT SPACES. Watertight integrity below the main deck of the LCU is provided by the
installation, during construction, of athwartships bulk- heads at frames 5, 17, 25, and 44.
At or above the main deck, compartments are protected by watertight doors as follows:
At the main deck level, watertight doors forward protect the damage control locker, the bosuns
storeroom, and the paint locker.
Port side main deck watertight doors lead to the galley, and the dry provisions storeroom.
Starboard side main deck watertight doors lead to the passageway, and the air conditioning and the
emergency generator room.
Section III. FIRE
2-5.
FIRE DAMAGE. In addition to the structural damage caused by battle or collision, fire is almost certain
to follow. Unless the fire is extinguished speedily and effectively, more serious damage than that caused by
the initial problem can result. Many ships have been lost by fire. Experience indicates that steel ships can
become floating furnaces, fed by the combustible and flammable materials carried on board. Some ships
have become blazing infernos which had to be abandoned and later sunk by our own forces because
fires got out of control and prevented the effective application of damage control actions.
Fire may cause the loss of a ship after other damage has been repaired or minimized. There is
a substantial amount of combustible material on board the LCU. Fire must be considered a potential
hazard requiring every effort to eliminate, control, and extinguish.
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