Edward Beach recounting an action by the Seawolf in
Submarine!:
Quote:
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As Deragon squats before the rising periscope, Warder busies himself with last-minute preparations for firing, "Make ready bow tubes!" he orders. Theoretically the torpedo tube outer doors should have been opened and the tubes flooded long ago, but experience has shown that the longer a torpedo is in a flooded tube the less chance it will run properly.
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That would seem to suggest they could be all be flooded and opened at the skipper's discretion.