sight for the first time. >> line up here in front of this young lady. >> not one of these selected patients has ever set foot on a ship before. they go through security screening. then, more testing. and every step of the way, making sure they are still fit for their operations. >> you cannot tell any friends. >> after her vital signs are checked, marlene and tracy are escorted to another part of the ship. this will be their home for the night. a few more tests, and it's time to get settled in. >> that's my bed for tonight. >> tomorrow will be a big day.