He can make it to the end of the tail, though it gets really crammed in towards the end. Tracing the distance that he travelled is hard at this point, but he can tell that he's well over a mile out under the ocean at this point, perhaps even two or more.
And at the end of the tail... the tunnel ends. There is another metre or two, and then comes a cave wall.
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And at the end of the tail... the tunnel ends. There is another metre or two, and then comes a cave wall.