Diving depths for modern subarines are usually around 500 meters or 1500 feet. I searched for some data for subs still in use today:
Akula - 480 m operational depth, 600 m test depth
Los Angeles - 950 ft (290 m)
Seawolf - 2,000 feet (610 m)
Virginia - 800 feet (240 m)
Kilo - 800 feet (240 m)
Oscar - couldn't find any data!
Typhoon - 400 m (1,300 ft)
Type 209 - 500 m
Dolphin (german) - At least 200 metres (660 ft)
Type 214 - 250m (400m theoretical)
Of course, that applies only to combat subs. Other kinds of descent vessels - say bathyscaphes for instance - can go a lot deeper and one even managed to sink 11.000 meters in 1960 all the way to the bottom of the mariana trench!
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