size set was in fact divided into sections. But  the bow section would not sink fast enough, due to its own buoyancy  and the narrow clearance between it and the tank.  James Cameron (I) (qv) observed that once "Gods 10,000,000 kW  light" had risen they would have to wait until the next night, and  suggested sinking the set, letting the air space between the two  decks fill with water, then raising the set again and quickly  sinking it before the water ran out. This worked.