A docking port, or docking hatch, was located on the hull of a spacecraft and allowed the crew access between their ship and another vessel or space station. The first docking hatches on Earth ships were used in the Apollo program spacecraft. A schematic of the Apollo Lunar Module depicting the location of the docking hatch was stored in the USS Enterprise's library computer database. This database was accessed by the Talosians in 2254. (TOS: "The Cage" , remastered) The docking ports on board an NX-class starship were located on E deck.