I've always been fascinated by submarine warfare and I just eat up information on it.
Recently I've been mostly confining my gaming to car racing sims ( I built a cockpit with proper pedals and a force feedback wheel so I can be Micheal Delaney at Le Mans )
But my mate recently pointed out that Silent Hunter 4 was on offer for $12 at the local gaming store, so I thought I would grab a copy.
You command a US sub in the Pacific theatre and the graphics are pretty damn good. The gameplay is customisable from arcade right through to extremely bloody difficult.
I've currently playing at 76% realism level because while I can set up an attack on a ship in full manual targeting mode I can't yet get a complete tactical picture of what is going on around me.
Which leads to pinging from active sonar, unexpected destroyers ramming you and depth charges.
So the map is set to 'g-ds eye view' for now....
The very best thing about SH4 is the radio though. It's an in game MP3 player which can 'tune in' broadcasts and play them on a certain date. The SH4 modding community have made sound packs available of real radio shows and news broadcasts.
If you install them and start your career in 1941 then you'll hear about Pearl Harbour on your first patrol, with all the uncertainty and confused reports before the situation becomes clear.
Plus the patrols can be long, before you get to an area where something is going to happen, and it helps to have the George Burns and Gracie Allen show in the background - Herman the duck is priceless

The only problem I have with SH4 is that it eats time and saving games is very unreliable. Setting up for a single attack can take a couple of hours or more, which is realistic,but I can't devote that much time on a regular basis.