Bulkheads can be watertight or non-watertight, and strict rules govern the opening and closing of the doors in a watertight bulkhead .
Amacandelo angangeni manzi asenokungangeni manzi okanye angene amanzi, kwaye imithetho engqongqo ilawula ukuvulwa nokuvalwa kweengcango kwincandelo elingangeni manzi kwindawo engangeni manzi.