I’m a search and rescue diver and the last part of my training was creppy as hell

The training went like this: a diver goes missing in a lake and the instructor is looking for him. I have to search for both of them. The lake is small and it was only 3m deep so it wasn’t that hard. I found the instructor by following the air bubbles and then I saw the missing diver. He was in a diving suit, but something was off. The equipment looked old, the suit was grey and had no color on it and the head gear didn’t have a glass to see though so I couldn’t see the diver’s face. I grabbed the diver and signaled the instructor to come over. The instructor showed me hand signals to go back to the surface. When we went up I asked the instructor if everything was OK. He said everything was fine. I asked about the diver but he said there was no diver. ?