During gameplay, type in these codes:

bedlkGod mode
imnotlucGod mode
haveallAll missions available
havesomeAll missions available
diditWin mission
wongaMoney
kamikazeSuicide
tonkaStrengthen hull
refillRestore shield
mutantRadiation protection
billySpeedup
tickAdd geiger counter
scottyBeam to Touka reef
rinseStage 0
dryerStage 1 
cottonStage 2
delicates Stage 3
tumbleStage 4
coloursStage 5
halfloadStage 6

To teleport, type SCOTTY to freeze the game. Then type in a location:

Touka
Boot
Flats
Beluga
Knob
Anchor
Veloca
Arch
Outlet2
Tryton
Pipe
Outlet3
Aquatraz
Volcano
Pipe2
Refinery
Cave
Bucket
Ribs
Tunnel
Outlet
Wood
Can
Limpet
Abyss
Cleft

Thanks to Revolution readers Philipp Unterbrunner, Henri Heiskanen, Lena10Rikke0,
Arjun and Vyas!