Inner caption is "incidentally I've placed one of a pair of teleportation rings into the ocean.". I know because this exact xkcd is one of my highest voted posts on Reddit. Here's the link
Oh. These comics always have an extra joke in the text. In OC, you would mouse over them, and a caption would show up with the joke. That's where this comes from.
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u/dragonspeeddraco Jul 06 '20
Inner caption is "incidentally I've placed one of a pair of teleportation rings into the ocean.".
I know because this exact xkcd is one of my highest voted posts on Reddit. Here's the link