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Captain, an unidentified ship approaching, over.

Roger that.

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It's August 1994, about 350 miles of the east coast of Canada.

Down in the control room of a state-of-the-art research vessel, an emergency light flashes code red.

Worried-looking crewmen huddle around sonar screens, their eyes scanning the glowing green monitors for a tiny blue dot.

Up on deck, rescue divers in thick rubber scuba suits anxiously await further instruction.

Beyond the ship's guardrails, the surface of the North Atlantic Ocean is a forbidding iron gray,

a mirror of the overcast sky.

But the crew aren't worried about conditions on the surface.

Their thoughts are fixed firmly on what is happening deep beneath it.

Early this morning, a small three-man submersible was looking at the fixed firmly on what is happening deep beneath it.

Early this morning, a small three-man submersible was launched from this vessel before descending 12,500 feet to conduct a research mission on the seabed.

Everything was going to plan, until about five hours into the dive, when the sub suddenly disappeared from the sonar screens and radio communication with the men on board was lost.

Now panic is rising on the surface.

The men down there can't have more than 10 hours of breathable oxygen left.

Even if they're still alive, they will soon be on borrowed time.

...