"Give me your hand, Harry, while I look over."
His comrade obeyed, and Jack was able to see about him.
Now on his left, not more than ten feet down, was a large doorway, with a flap similar to the doors on the water-side warehouses, in London, from where the stores are lowered and raised from the barges by means of an iron crane.
"I wonder what place that is?" said Jack; "if I could only reach it, my fall would be very considerably broken."
He had a try.
They fastened their two scarves together, and Harry, making himself a secure hold above, lowered Jack, and the latter swinging backwards and forwards twice, dropped the second time fairly on the ledge.
It was a perilous hold.
But Jack was only second to Nero in monkey tricks, and he held on in a most tenacious manner.
Swinging himself up he pushed his way into a dark and gloomy place.
A low vaulted chamber, dimly lighted by a flickering old lamp.