Your sub will go deeper. I think the shallow depth gauge stops at 165, but if you look under the dial, you'll see a tab that you an click and it will switch it to the deeper dive dial. You can change each dial by clicking the tab beneath it.
You can also keep diving by hitting the D key. I assume stock has this or an icon you can click, mods differ. You just have to remember to stop the dive, mine is the A key to level. Hit F1 and look at your shortcut commands for complete info.
I think you can obtain air radar at the start of the war in stock or at least after one patrol, just give yourself some renown at the start to purchase it with. Surface radar will become available after a patrol or two depending on mods, ect.
You can raise your air radar by pressing the T key while submerged at scope depth to check for planes before you surface.
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