On the east of Pearl Harbor, facing Ford Island, an inlet north of the Navy Yard forms South-East Loch. On its eastern shore the headquarters building of CinCPAC stood and moored on that side of the loch were torpedo boats, submarines and their support ships as well as one or two auxiliaries. From the south east of the loch to the north east, wrapped around the buildings on the shore, were oil storage tanks, the "tank farm". Fortunately it was not targeted by the Japanese who might otherwise have had the satisfaction of destroying half the fuel store (the other half was in the Navy Yard near the hospital) and of frying the Navy high command.
You can find out more about the layout of Pearl Harbor in the following Osprey book: