Depth Dewellers

- During the game press
 
[Ctrl]+[Alt]+[I] : God mode
[Ctrl]+[Alt]+[L] : Extra live
[Ctrl]+[Alt]+[F] : All weapons
[Ctrl]+[Alt]+[N] :  Warp to the next level

- Level One Secret Location

Upon discovering the first of the wandering blokes, you 
will see a wall panel with green slime oozing out.  
Behind that you'll find some bonus items.