https://www.youtube.com/watch?v=mo3bBsU0k_k USS Razorback Submarine Dive Alarm
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https://en.wikipedia.org/wiki/Crash_dive
Crash dive
A crash dive is a maneuver by a submarine in which the vessel submerges as quickly as possible to avoid attack. Crash diving from the surface to avoid attack has been largely rendered obsolete with the advent of nuclear-powered submarines, as they normally operate submerged. However, the crash dive is also a standard maneuver to avoid a collision. ...
https://www.quora.com/Can-a-submarine-dive-into-the-sea-quickly-How-fast-is-the-fastest-one
Can a submarine dive into the sea quickly? How fast is the fastest one?
Unlike in WW2, most submarines spend virtual all of their time submerged.
Depends on the circumstances. In an emergency (on a Trident sub), a crash dive would still take at least five minutes, but normal time would be 10–15 minutes.
Mitchell Huang
, former US Navy Submarine Officer at United States Navy (1996-2002)
Answered June 13, 2017
We can submerge within about ten minutes. Of course there are other conditions that must be met before the OOD gives the order to submerge the ship. But once the order is given, it takes about 10 minutes before you can no longer see the ship from the surface.
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Ref.
https://www.usna.edu/Users/physics/mungan/_files/documents/Publications/TPE2.pdf
How Quickly Can a Submarine Dive?
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https://www.youtube.com/watch?v=vF8JKkRo5fk
Dive! Dive! Dive! US Submarine Goes Down Under
Before a routine dive - especially to great depth - you want to make sure the sub is buttoned up, with all of the hatches closed and dogged, and all other openings to the sea (e.g. torpedo tubes, trash ejector, signal ejectors, etc.) secured as well. Then the main ballast tank vents are opened and the planes angled to drive the boat down. The process could take anywhere from 15 minutes to a half hour depending on...
Before a routine surfacing ... .... take from 15–30 minutes.
https://en.wikipedia.org/wiki/Crash_dive Crash dive
Once all hatches and induction vents are closed, the diving planes (like the control surfaces of an airplane) pull the boat below the surface and level it out at the desired depth—typically between 70 and 90 metres (230 and 300 ft).[1]
In contrast, an Ohio-class ballistic-missile submarine may take as long as five minutes to reach periscope depth from the surface.
In extreme emergencies, submarines have had to crash dive so quickly that lookouts were left on-deck. Such was the only survivor of U-68 when the four lookouts were left top-side as she crash dived among exploding aerial bombs.[3]
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https://www.quora.com/Is-crash-diving-still-a-viable-submarine-tactic
Is crash diving still a viable submarine tactic?
. In a nuclear sub, there is no need to operate on the surface in hostile water, so at least on Trident submarines, we never performed a crash dive. However, while operating at periscope depth, if an airplane was spotted through the periscope, we would perform an ¡°emergency deep¡±, a single order that brought the main engines to ¡°ahead full¡±, and would take us down to a safe, deep depth (not the deepest we could safely go).
. PS - A ¡°crash dive¡± does not necessarily mean that the submarine goes to the greatest depth that it is capable of going to, only that it leaves the surface as rapidly as it is capable of doing so. Taking a submarine to its ¡°depth ceiling¡± is dangerous in and of itself.
. Yes, of course. Disappearing and running as fast as possibly is still a viable tactic on almost any type of disadvantage encounter when you are on the water surface.