The main engines and boilers are situated in watertight compartments known as engine rooms and boiler rooms, and in larger ships there may be two or more of each to guard against complete immobilisation of the main machinery by one hit from a torpedo or mine.
Iinjini ezingundoqo kunye nezibilisi zikwindawo zokuhlala ezingangenwa manzi ezaziwa ngokuba ngamagumbi eenjini kunye namagumbi ezibilisi, kwaye kwiinqanawa ezinkulu kusenokubakho amagumbi oku amabini nangaphezulu okugada ekulweni ukonakala komatshini ngenxa yokudutyulwa ngembumbulu ende okanye yibhombu.