第十九章（终章）：威力蓄须王的继承人(16)

A dragon's breath, even when it exhales, is composed almost entirely of pure oxygen. It is this that makes it so very flammable. All they needed to do was to rise to the surface (slowly so as not to get the bends) with Toothless swimming beside them and occasionally blowing into their noses when they ran out of breath.
A dragon never runs out of breath because just below its horns it has a fully working set of gills. As soon as it enters the sea it can shut off its lungs and get its oxygen from the water rather than the air.

Hiccup and Fishlegs resurfaced after about ten minutes. There was plenty of debris floating around, because they were not far from where the Lucky Thirteen had made its final journey to the bottom of the ocean. The boys each got hold of one end of an oar, and steered their way around the corner to where there was a beach to land on.
Fishlegs tried to persuade Hiccup to change his mind all the way home.