 Wally Schirra, the backup commander for the mission, suggested to Shea that Shea should go through the countdown test in the spacecraft with the crew in order to experience first-hand the issues that they were facing.Although he seriously considered the idea, it proved to be unworkable because of the difficulties of hooking up a fourth communications loop for Shea.The hatch would have to be left open in order to run the extra wires out, and leaving the hatch open would make it impossible to run the emergency egress test that had been scheduled for the end of the day on the 27th.