3. The Improbability Drive, in one of its nastier coincidences, has transported you inside the very same whale you created when you used the Drive to save the ship during the missile attack.
4. If you recall, the missiles were turned into a sperm whale, which was last seen plummeting through the atmosphere of Magrathea. This explains why, after a few turns, the whale invariably splats (and you along with it).
