CHAPTER XVI
HITTING CLOSE TO THE SALT TRAIL
"Give us a rocket signal if you need help," Dave signalled the attendant mine-sweeper.
Then to the officer of the watch:
"Give us full speed, and we'll run down to see if the 'Reed' has work enough for two of our kind."
A little further south he signalled same orders to the patrol boat that he had given to the mine-sweeper.
Then the "Grigsby" rushed onward as if she scented something of which she did not wish her crew to be deprived.
As soon as Darrin discovered that Dalzell was using his searchlight he ordered the "Grigsby's" also to be used. Over the waters the bar of light swept until it picked up a sight that made the officers on the bridge gasp for sheer astonishment.
Two submarines, some five hundred yards apart, lay on the surface of the sea.
Strangest part of all, neither craft was serving its guns. Why they neither fought nor dived puzzled the "Grigsby's" officers until the "Reed's" guns ceased firing and her blinkers signalled to Dave:
