A person in full astronaut suit and gear trains in an underwater lab as a scuba diver assists.
An astronaut working with an alien to repair a satellite.
An scuba diver would not be considered an alien. A satellite is in space, not underwater.
A person cannot be training in an underwater lab and repairing a satellite simultaneously.
The astronaut cannot be working with a scuba diver who is also an alien as it is almost impossible that both can be the same.