This arrangement had been made, as Clewe wished to follow the Dipsey for a time, in order to see if everything was working properly with her.

She kept on a straight course, flashing a light into the little globe every now and then; and finally, after meeting some floating ice, she shattered the globe with an explosion, which was the signal agreed upon to show that all was well, and that the Dipsey had started off alone on the submarine voyage to the pole.
Roland Clewe gazed out over the wide stretch of dark-green waves and glistening crests, where nothing could be seen which indicated life except a distant, wearily-flapping sea bird, and then, turning his back upon the pole, he made preparations for his return voyage to New York, at which port he might expect to receive direct news from Sammy Block and his companions..