 The team is investigating an energy spike that they picked up in space with the jumper. On the surface they discover an entrance to the inside of a ridge. McKay detects a field is protecting it. Sheppard throws in a stone that disappears. McKay puts a camera on a stick and after viewing the footage concludes it look safe behind the field. Sheppard volunteers to step in, but can t step out anymore. He s pulled in. McKay takes a look at the camera again, he notices the memory is full. Almost two hours of footage was recorded and the battery is dead. Time is going very fast inside the field. He must think of a solution quickly. Meanwhile Sheppard has given up hope of being rescued and starts exploring.