I know what was the motor that caused the schooner to go at such an extraordinary speed without sails and without a screw.

Her indefatigable motor is emerging from the sea, after having towed her from the coast of America to the archipelago of the Bermudas.

There it is, floating alongside--a submersible boat, a submarine tug, worked by a screw set in motion by the current from a battery of accumulators or powerful electric piles.
On the upper part of the long cigar-shaped iron tug is a platform in the middle of which is the "lid" by which an entrance is effected.

In the fore part of the platform projects a periscope, or lookout, formed by port-holes or lenses through which an electric searchlight can throw its gleam for some distance under water in front of and on each side of the tug.

Now relieved of its ballast of water the boat has risen to the surface.