Seastalker was Infocom's 12th game (and the first to be officialy aimed at the beginner adventurer).
- TECLAS -
Some special commands you should know:
SET THROTTLE TO SLOW (or MEDIUM or FAST) - changes the subs' speed DIVE TO 5 METERS (or 10 or 15 or 20 etc.) - in increments of five meters.
SURFACE - your sub surfaces.