During gameplay, type in these codes:

bedlk		God mode
imnotluc	God mode
haveall		All missions available
havesome	All missions available
didit		Win mission
wonga		Money
kamikaze	Suicide
tonka		Strengthen hull
refill		Restore shield
mutant		Radiation protection
billy		Speedup
tick		Add geiger counter

scotty		Beam to Touka reef
rinse		Stage 0
dryer		Stage 1 
cotton		Stage 2
delicates 	Stage 3
tumble		Stage 4
colours		Stage 5
halfload	Stage 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!