McKay finds himself trapped in a sinking Puddle Jumper, and hallucinates help in the form of Samantha Carter. Meanwhile, Weir approves a rescue attempt which sees Sheppard and Zelenka diving down with a 1,000ft cable and a magnetic grapple. Eventually, a whale that begins to circle the stricken craft offers unlikely assistance. Joe Flanigan and Torri Higginson star