Its lid will open and fresh air will penetrate it to every part.

In all probability, if it remained submerged during the day it rose at night and towed the _Ebba_ on the surface.
But if the mechanical power of the tug is produced by electricity the latter must be furnished by some manufactory where it is stored, and the means of procuring the batteries is not to be found on Back Cup, I suppose.
And then, why does the _Ebba_ have recourse to this submarine towing system?
Why is she not provided with her own means of propulsion, like other pleasure-boats?
These are things, however, upon which I have at present no leisure to ruminate.
The lid of the tug opens and several men issue on to the platform.
They are the crew of this submarine boat, and Captain Spade has been able to communicate with them and transmit his orders as to the direction to be taken by means of electric signals connected with the tug by a wire that passes along the stem of the schooner.
Engineer Serko approaches me and says, pointing to the boat: "Get in." "Get in!" I exclaim.
"Yes, in the tug, and look sharp about it." As usual there is nothing for it but to obey.

I hasten to comply with the order and clamber over the side.
At the same time Thomas Roch appears on deck accompanied by one of the crew.

He appears to be very calm, and very indifferent too, and makes no resistance when he is lifted over and lowered into the tug.

When he has been taken in, Count d'Artigas and Engineer Serko follow.
Captain Spade and the crew of the _Ebba_ remain behind, with the exception of four men who man the dinghy, which has been lowered.