Jack looked over to the jagged edges beside them as they swam along. It was wrong all of it, and unsettling. Maybe it was the place, but it wasn't supposed to be like this. He didn't remember it being like this. He'd swam down here, and it never was.

He couldn't quite work out what that meant.

"Yeah," he said, looking back to the Doctor, over his shoulder. "Fishes. Stuff like you had in that sandwich. Nothing dangerous. The waters out here are safe until the reefs off about a mile or so out. Well. They should be."

Up ahead the rock seemed to crumble a little, it looked fresh and Jack gestures towards it. "Hey, look at this. Think we're near?"