How many feet can a uboat dive in 60 seconds?

Answer 1

Most U-boats of WWII were physically capable of diving to maximum depths of around 150-160 feet, although they seldom ventured that deep unless in an emergency. They could attain this depth in approximately 60-65 seconds. Advanced designs in hull reinforcement, mainly pioneered by Germany made this possible. The modern military submarines of today have hull-crush depths of closer to 1,500 feet and that number is growing with advances in technology all the time. These kinds of depths take much longer to reach, depending on dive rate, but can take in the region of 20-45 minutes. (Exact figures are hard to come by, as such information is often classified) Some cutting-edge un-manned submersibles are capable of diving to depths in excess of three times this depth but dive much slower, as their engines are not as powerfull as those of a manned submarine.