The simple way I look at this is to do a bunch of dives during the day and become very familiar with the site. At night you'll recognize the same things.
Now that sounds pretty cool. I explored (non-scuba) an old Atlas missile silo in Colorado over 20 years ago. Great fun. Diving in one would be a nice twist.
When I did my RD course I found it was more mental awareness of the situation than the physical ability. I had thought I needed to haul a 250# guy out of the water but he wasn't available (yeah). But the key is knowing how to respond to the gear the person in need has.
Before I switched to my drysuit I had used an O'Neill J Suit. Very nice. I used this in 45 degree water and it was great. Just got cold when I was out of the water which is why I switched to a dry suit.
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