On a dense, foggy, late July evening in 1956, the Italian-flagged cruise liner "Andrea Doria," bound for New York, was struck broadside by another cruise ship. After an agonizing eleven hours, the relentless sea would drag her down, settling the "Doria" uneasily into the murky Atlantic ocean floor nearly two hundred and fifty feet below. AmazingIy, due to a daring and fevered rescue operation by her oceangoing brethren, only fifty-one of the more than 1,700 people on board both ships were killed in the collision. Years have passed since that tragedy, yet the "Andrea Doria" is still taking lives. Deep Descent Drawn by the sirens call of adventure, a small but fanatical group of extreme scuba divers has long challenged the "Andrea Doria," pushing themselves far beyond the limits of recreational divers, up to the very limits of human endurance.