Watertight Bulkhead 1 : A bulkhead (wall) strengthened and sealed to form a barrier against flooding in the event that the area on one side fills with liquid
NFPA 1405 Guide for Land-Based Fire Fighters Who Respond to Marine Vessel Fires, 2001 ed. http://www.nfpa.org/assets/files/AboutTheCodes/140 5/1405-F2005-ROP.pdf, (Guide: Land-Based Fr Fightr Who Respond to Mrn Vssl - Amer) {396 NFC}