Navy divers were plunged into the war with the Japanese raid on
Pearl Harbor. The raid began at 0755 on 7 December 1941; by 0915 that same
morning, the first salvage teams were cutting through the hull of the overturned
battleship USS Oklahoma to rescue trapped sailors. Teams of divers worked to
recover ammunition from the magazines of sunken ships, to be ready in the event
of a second attack.
The immense salvage effort that followed at Pearl Harbor was highly successful.
Most of the 101 ships in the harbor at the time of the attack sustained damage. The
battleships, one of the primary targets of the raid, were hardest hit. Six battleships
were sunk and one was heavily damaged. Four were salvaged and returned to the
fleet for combat duty; the former battleships USS Arizona and USS Utah could not
be salvaged. The USS Oklahoma was righted and refloated but sank en route to a
shipyard in the U.S.
Battleships were not the only ships salvaged. Throughout 1942 and part of 1943,
Navy divers worked on destroyers, supply ships, and other badly needed vessels,
often using makeshift shallow water apparatus inside water and gas-filled
compartments. In the Pearl Harbor effort, Navy divers spent 16,000 hours underwater
during 4,000 dives. Contract civilian divers contributed another 4,000
diving hours.
While divers in the Pacific were hard at work at Pearl Harbor, a
major challenge was presented to the divers on the East Coast. The interned
French passenger liner Normandie (rechristened as the USS Lafayette) caught fire
alongside New York City’s Pier 88. Losing stability from the tons of water poured
on the fire, the ship capsized at her berth.
The ship had to be salvaged to clear the vitally needed pier. The Navy took advantage
of this unique training opportunity by instituting a new diving and salvage
school at the site. The Naval Training School (Salvage) was established in
September 1942 and was transferred to Bayonne, New Jersey in 1946.
Salvage operations were not the only missions assigned
to Navy divers during the war. Many dives were made to inspect sunken enemy
ships and to recover materials such as code books or other intelligence items. One
Japanese cruiser yielded not only $500,000 in yen, but also provided valuable
information concerning plans for the defense of Japan against the anticipated
Allied invasion.
Harbor Clearance Unit One (HCU 1) was commissioned 1 February
1966 to provide mobile salvage capability in direct support of combat operations
in Vietnam. Homeported at Naval Base Subic Bay, Philippines, HCU 1 was dedicated
primarily to restoring seaports and rivers to navigable condition following
their loss or diminished use through combat action.
Beginning as a small cadre of personnel, HCU 1 quickly grew in size to over 260
personnel, as combat operations in littoral environment intensified. At its peak, the
unit consisted of five Harbor Clearance teams of 20 to 22 personnel each and a
varied armada of specialized vessels within the Vietnam combat zone.
As their World War II predecessors before them, the salvors of HCU 1 left an
impressive legacy of combat salvage accomplishments. HCU 1 salvaged hundreds
of small craft, barges, and downed aircraft; refloated many stranded U.S. Military
and merchant vessels; cleared obstructed piers, shipping channels, and bridges;
and performed numerous underwater repairs to ships operating in the combat
zone.
Throughout the colorful history of HCU 1 and her East Coast sister HCU 2, the
vital role salvage forces play in littoral combat operations was clearly demonstrated.
Mobile Diving and Salvage Unit One and Two, the modern-day
descendants of the Vietnam era Harbor Clearance Units, have a proud and distinguished
history of combat salvage operations.
