Following the death of his father, Jay Gardiner goes diving off the central Coast of California in search of his remains, but is swallowed by a massive sperm whale. While trapped inside its belly with only one hour of oxygen left, Jay comes to realize that the hard-earned lessons his father imparted may be the key to his escape.
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Whalefall recap and ending explained (spoilers)
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Ending explained (spoilers)
How does Jay end up inside the sperm whale?
He dives off the central California coast to search for his deceased father's remains and, while underwater, is swallowed by a massive sperm whale—leaving him trapped inside with only about an hour of oxygen.