I recently got into realistic combat simulators (Squad, Arma, DCS, Cold Waters ... there are some other sub sims out there too) and I had no idea JiveTurkey and Aaron were the same person. Maybe I just missed it or wasn't paying attention.

Anyway, if you're a military geek and want to get into realistic naval combat sims play Cold Waters (Uboat is also good, but way different play style). Like all realistic sims the learning curve is pretty steep, but during lockdown having something to concentrate on and enable a bit of a disconnection from the rest of the world for a while is nice.

688(I) Hunter/Killer with the Jane's manual is great too. I find it more immersive than Cold Waters as you are in charge of the waterfall and have to move the cursor like a true sonarman to find the good signature.

If you liked 688(I), I strongly recommend giving Dangerous Waters a shot. It’s a sequel made by the company, featuring submarines as well as surface and helicopter platforms, and is currently on sale.

https://store.steampowered.com/app/1600/Dangerous_Waters/