"Oh I hope so," he replied with a twist of a grin. "But don't worry, I'll always keep you on your toes." Because of course there was no way Jack Harkness would ever allow anything to stagnate. And he was quite certain that would never happen.

Jack watched the Doctor as he disappeared into the water and he was behind him, merely a pace or two.

He braced as he hit the water, the cold biting and taking his breath away. "Jesus!" he said to himself, and took a deep breath before ducking beneath the surface and following him down.

The water seemed a little more clouded before, and it was certainly colder, but it seemed to clear up a little the lower they got. He continued down until he reached the bed and reached out an arm for the Doctor beside him.