The naval base on San Francisco Bay where Chekov and Uhura located the aircraft carrier Enterprise in 1986 and tapped its nuclear reactor to recrystallise their ship's dilithium.
Alameda features in Star Trek IV: The Voyage Home. With the dilithium of their captured Klingon bird-of-prey decaying, Spock proposes collecting high-energy photons from a fission reactor, and Chekov and Uhura are sent to find the nuclear vessels of the United States Navy, asking startled passers-by for directions to Alameda.
They discover that the carrier USS Enterprise is in port and beam aboard at night with a collector. The drain is noticed, and although Uhura is transported out with the device, Chekov is seized, interrogated as a suspected spy and badly hurt in a fall while trying to escape.
He is taken to Mercy Hospital, from which Kirk, McCoy and Gillian Taylor later retrieve him. The carrier scenes were filmed aboard USS Ranger.