The floor itself was regular, but not sufficiently so to prevent their walking over it with comparative ease.

The stream was only five or six feet in width and wherever examined was found to be quite shallow.

It flowed at a moderate rate, and it entered the cavern from beneath a rock that ascended continuously from the floor to the roof.
"Freddy, my laddy; do you take this torch and walk off aways, so that it will be dark here," said Mickey to his companion.
The latter obeyed, and the man made as critical an examination as he could.

His object was to learn whether the water came into the cave from the outer world, or whether its source was beneath the rock.

If the former, there was possibly a way out by means of the stream, provided the distance intervening was not too great.