Work on the access tunnel was begun in 1968.

There was no access tunnel; the sphere had to be loaded and unloaded while on deck.

This tender had a corridor connection and an access tunnel through the water tank.

Several inconsistencies exist between the internal set and the external set, the cockpit access tunnel angle being the most noticeable.

They all narrowly avoid the military's invasion of the prototype labs, teleporting to the safety of an unnoticed access tunnel.