CHAPTER IX.
INSIDE BACK CUP.
The next morning I am able to make a first inspection of the vast cavern of Back Cup.

No one seeks to prevent me.
What a night I have passed! What strange visions I have seen! With what impatience I waited for morning! I was conducted to a grotto about a hundred paces from the edge of the lake where the tug stopped.

The grotto, twelve feet by ten, was lighted by an incandescent lamp, and fitted with an entrance door that was closed upon me.
I am not surprised that electricity is employed in lighting the interior of the cavern, as it is also used in the submarine boat.

But where is it generated?
Where does it come from?
Is there a manufactory installed somewhere or other in this vast crypt, with machinery, dynamos and accumulators?
My cell is neatly furnished with a table on which provisions are spread, a bunk with bedding, a basket chair, a wash-hand-stand with toilet set, and a closet containing linen and various suits of clothes.

In a drawer of the table I find paper, ink and pens.
My dinner consists of fresh fish, preserved meat, bread of excellent quality, ale and whisky; but I am so excited that I scarcely touch it.
Yet I feel that I ought to fortify myself and recover my calmness of mind.