I expected every moment my poor little vessel would be staved against the rock, and I overwhelmed with waters; and for that reason never once attempted to rise up, or look upon my peril, till after the commotion had in some measure ceased. At length, finding the perturbation of the water abate, and as if by degrees I came into a smoother stream, I took courage just to lift up my affrighted head; but guess, if you can, the horror which seized me, on finding myself in the blackest of darkness, unable to perceive the smallest glimmer of light. However, as my boat seemed to glide easily, I roused myself and struck a light; but if I had my terrors before, what must I have now! I was quite stupefied at the tremendous view of an immense arch over my head, to which I could see no bounds; the stream itself, as I judged, was about thirty yards broad, but in some places wider, in some narrower. It was well for me I happened to have a tinder-box, or, though I had escaped hitherto, I must have at lust perished; for in the narrower parts of the stream, where it ran swiftest, there were frequently such crags stood out from the rock, by reason of the turnings and windings, and such sets of the current against them, as, could I not have seen to manage my boat, which I took great care to keep in the middle of the stream, must have thrown me on them, to my inevitable destruction. Happy it was for me, also, I was so well victualled, and that I had taken with me two bottles of oil (as I supposed, for I did not imagine I had any more), or I had certainly been lost, not only through hunger, for I was, to my guess, five weeks in the vault or cavern, but for want of light, which the oil furnished, and without which all other conveniences could have been of no avail to me. I was forced to keep my lamp always burning; so, not knowing how long my residence was to be in that place, or when I should get my discharge from it, if ever, I was obliged to husband my oil with the utmost frugality; and notwithstanding all my caution, it grew low, and was just spent, in little above half the time I stayed there.