While
patrolling Pearl Harbor Entrance on Sunday, December 7, 1941, the
U.S.S. Ward attacked an unidentified submarine in the Restricted Area
off the Harbor.
A dispatch by voice transmission was sent to Commandant, Fourteenth Naval District at 0645 which stated:

“We have attacked, fired upon, and dropped depth charges on a submarine operating in defensive sea areas.”

Utah (AG-16) being torpedoed.
The attack on the fleet at Pearl Harbor lasted a little under two hours, but for Utah,
it was over in a few minutes. At 0801, soon after sailors had begun
raising the colors at the ship’s fantail, the erstwhile battleship took a
torpedo hit forward, and immediately started to list to port, then capsized.
Bottom photo is how she appears today.