if you dont pick up the map in the ship graveyard (coz some ninny might forget ie:me) then it appears in the fire ship after the first elevator.
have you reached the room where there are four tunnels leading to a mesh of conveyor belts? take the second tunnel. you'll fall into a room with another conveyor belt (i hope) dont use that conveyor belt and go into the room which is a save point. the next room just requires you to pull all the switches and then you go through to the boss
i think thats right. but i did it from memory so if its not let me know and i'll see where i went wrong