CFR › Title 46 › Part 78 › §78.15-146 CFR §78.15-1Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)All watertight doors in subdivision bulkheads shall be kept closed during navigation except when necessarily opened for working of the vessel, and in such cases they shall always be ready to be immediately closed.(b)[Reserved]