Creatures of the Abyss by Murray Leinster — Read

As the _Esperance_ sailed northward, she looked almost unreal. From a distance she might have been an artist's picture of an imaginary yacht heeled over in the wind, sailing splendidly over a non-existent ocean. The sky was a speckless blue, the sun was high.

But she was real enough, and the China Sea around her was genuine, and what had taken place where the _Pelorus_ lay now hull-down, stowing a ruined bathyscaphe in her hold, had unquestionably taken place.