In Sid Meier's Alpha Centauri, new bases are created by a colony pod. You can build bases on land or sea.

Colony pod (SMAC)
Rover colony pod (SMAC)

Colony pod with a speeder chassis.

Sea colony pod (SMAC)

Sea colony pod with a foil chassis.

Drop colony pod (SMAC)

Fastest way to get to where you want to be is to just it.

Penetrator colony pod (SMAC)

With a name like that, and it looking like that, I can't help but imagine a large pill is being flown up my back end.

Chopper colony pod (SMAC)

The airplane can go farther, so I don't see any point in a copter of equal cost.