We had a lantern, so it was not dark.
And in each 20 meters there was a sort of window.

PS Cytrav its me Jorge lol.

Sorry about that, Jorge. I thought somewhere I saw a picture of you labeled 'Jorge' and assumed someone else would have done that - like a wife and you would have labeled yourself 'me'! (or even cytrav)

Any way, I enjoyed both your pictures and your shared information.

polly is right..maybe out guide could get us a long tail boat to go through the tunnel?? gpanda would row...