No getting at her.

And I don't believe there's another destroyer yet fitted with this apparatus, whatever it may be." "They must be making them somewhere, though," Sir Alfred remarked.
His nephew nodded.
"To think," he muttered, "that we've two hundred men spread out at Tyneside, Woolwich and Portsmouth, and not one of them got on to this! A nation of spies, indeed! They're mugs, uncle." "Not altogether that," the banker replied.

"We have some reports, although they don't go far enough.

I can put you on to the track of the thing.

The apparatus you saw is something in the nature of an inverted telescope, with various extraordinary lenses treated by a new process.
You can see forty feet down under the surface of the water for a distance of a mile, and we believe that attached to the same apparatus is an instrument which brings any moving object within the range of what they call a deep-water gun." "Did that come from reports ?" Granet asked eagerly.
"It did," Sir Alfred said.