"We had well over 500 porthole lights, but we had problems with the lights getting hot and then being dunked in the cold water. We sank different parts of the ship over and over again. Testing lights for taking this kind of abuse was absolutely paramount. One solution was to leave the lights off until just before we sank anything. If they were on any longer than 15 minutes, they'd get so hot that they'd just blow out. So we'd light the fixtures, turn them off to allow them to cool, turn them back on, and then go for it." -- Russell Carpenter, ASC