I took a series of deep breaths, lifted my arms above my head, joined my legs, expelled the air from my lungs in a rush of bubbles, and slowly sank. At a depth of ten feet or so, the weight of water building on skull and skin, I fanned my hands to keep myself steady, and opened my eyes. Pressure pushed gently against my eyeballs. Ahead of me in the water was the black mouth of a tunnel entrance, leading away into the rock, more than wide enough to engulf me, its stone edges smooth. The pull of the mouth through that eerily clear water was huge. Just as standing on the edge of a tower one feels
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