The battleship USS
Pennsylvania (BB-38), along with the wrecked destroyers
Cassin (DD-372) [the partially capsized destroyer to the right of the picture) and
Downes (DD-375) in Drydock 1 at the Pearl Harbor Naval Shipyard, shortly after the Japanese attack on December 7, 1941. The cruiser in the background, visible behind the crane is
Helena (CL-50) (which suffered moderate damage from a single torpedo hit,) while the battleships
Oklahoma (BB-37),
California (BB-44), &
Maryland (BB-46) are visible in the far background. The plume of smoke in the background was from the burning wreckage of
Arizona (BB-39).
At the time of the Japanese attack,
Pennsylvania,
Cassin, &
Downes were all in drydock for maintenance, and thus protected from torpedoes, although several Japanese torpedo plane pilots did make unsuccessful attempts to wreck the drydock by torpedoing the gates to the dock. However, all three ships were subjected to bombing and strafing attacks,
Pennsylvania being hit by a single bomb, which wrecked a 5" secondary gun.
The destroyers were less fortunate, as they sustained several near misses, one of which ruptured a fuel tank on
Downes, spewing fuel oil across the drydock floor, which was ignited by an incendiary bomb that landed between the two destroyers. Despite attempts to put out the fire by flooding the drydock, the flames grew out of control, and both destroyers were abandoned as their ammunition started cooking off, leading to a series of explosions that thoroughly wrecked both ships and showering
Pennsylvania with shrapnel, as well as knocking
Cassin off the blocks she was resting on and causing her to fall over onto
Downes.
Despite the bomb hit and suffering a degree of fire damage from the conflagration in the drydock,
Pennsylvania was still operational, but nevertheless was sent to the West Coast for a series of repairs and upgrades that lasted 3 months.
Although the destroyers were, for all practical purposes, total losses, they were still salvaged and "repaired" as a matter of pride, though the the repairs required were so extensive that they took two years to complete, and amounted to building new ships to the original design, utilizing what equipment and other components could be salvaged in the process.