The Raid of Le Vengeur by George Griffith

Curiously enough, while Captain Leon Flaubert had been worrying himself to the verge of distraction over the problem of seeing under water, and had apparently solved it by substituting electric nerves of feeling for the sight-rays which had proved a failure, Mr. Wilfred Wallace Tyrrell had brought to a successful conclusion a long series of experiments bearing upon the self-same subject.

Mr. Tyrrell was the son of Sir Wilfred Tyrrell, one of the Junior Lords of the Admiralty. He was a year under thirty. He had taken a respectable degree at Cambridge, then he had gone to Heidelberg and taken a better one, after which he had come home entered at London, and made his bow to the world as the youngest D.Sc. that Burlington Gardens had ever turned out.