Plot summary
During the test run of a recently repaired puddle jumper, Captain Hugh Griffin is getting under Dr. McKay's skin by espousing various ideas about science history, including the myth of the flat Earth during Columbus' time. But the jumper crashes into the ocean and sinks slowly to the bottom. Eventually the pressure is too great for the windows and Griffin sacrifices himself to seal McKay into the rear compartment. When he shows the first signs of losing hope, he must rely on a hallucination of Lt. Col. Samantha Carter for his survival.
Credits
Adapted from Wikipedia contributors, Stargate Atlantis season 2. HTML formatting and reference markers removed.