Author's Notes:
Written for Challenge 233: Aquatic at dw100.

Summary: The Doctor sometimes wishes he could explore the depths of oceans.

Nature is incredibly diverse; the universe throngs with creatures, both sentient and not, adapted to suit every kind of environment imaginable.

There are creatures who swim through sand as though it were water, and others to whom vast ice-fields feel pleasantly warm. Still more make their homes deep underwater, shunning the surface where they’d suffocate, unable to breathe air not extracted from water by their gills. These aquatic creatures are the ones the Doctor knows least about; he can’t breathe their atmosphere any more that they can breathe his, but he envies their freedom to explore where he can’t go.

The End