If a submarine is destroyed underwater during an engagement, how can the crew escape? Is the survival rate high?

Seeing this question reminds us of the Russian army's Kursk nuclear submarine, August 12, 2000, the Russian army military exercises in the Barents Sea, the Kursk's task in this exercise is to launch a drill torpedo to the nuclear-powered guided-missile cruiser Peter the Great, but unfortunately in the drill torpedo launch soon after the Kursk's internal explosion suddenly led to leakage, and therefore sank to the bottom of the sea more than a hundred meters deep, 118 officers and men on board were all killed. The Kursk sank to the bottom of the sea at a depth of more than 100 meters, killing all 118 officers and men on board. The incident was the worst submarine accident in modern history.

The Kursk is an Oscar-class nuclear submarine, the most powerful single-ship firepower in the history of mankind's naval battle equipment, the Russian army is specifically used to hunt the U.S. aircraft carriers, the cost of which reached 1 billion U.S. dollars, the boat is 150 meters long, six-story high, with a unique double-hulled, nine waterproof compartments, even if it is hit by torpedoes, but also will not be silenced, but also has a lifesaving device on top of the boat, it is such a state-of-the-art a Behemoth, after the accident his crew did not escape successfully. Although the past almost 20 years, technology has also had enough development, but the submariners escape is still a big problem. Although submariners are the most highly paid, they are the most dangerous. About the submarine underwater accident, submariners should be how to escape, I will say from the shallow sea and deep sea two situations.

If it is shallow sea, then this is good to do, first of all, the crew to plug the leak, plug the leak, and then drainage, in the reduction of pressurized water in the sea water to make the submarine floating, so as to realize self-rescue; if the plugging of leakage can not be blocked, the submarine is waste, then you can wear escape suit through the torpedo tubes to escape, out of the water to grab a prior launch out of the lifesaving buoy rope, and then to climb slowly, must be slow, rise too fast, and then to climb. Must be slow, rise too fast there is a risk of decompression sickness.

If something happens in the deep sea, seawater pressure is too great, this again from the torpedo tube escape is equal to suicide. Modern submarines are equipped with an escape hatch, this escape hatch can decompression, after the accident, must abandon ship, all crew members to quickly reach the escape hatch to realize self-rescue. For example, Russia's Typhoon class nuclear submarines are equipped with two collective floating escape pods.

The above two are said to be the submariner's self-rescue, and external rescue this way. But the deep sea rescue is extremely difficult, submarine accident survival rate of officers and men is very low. External rescue, as the name suggests, through the outside of the comrades rescue, submarine accident should be the first time to contact the external friendly forces, waiting for rescue. There are two kinds of external rescue, one is the life-saving submarine, the other is the life bell, both of which need to be hoisted into the water through the lifeboat, of course, we need to know the coordinates of the accident beforehand, and this kind of rescue is more time-consuming, and often delays the rescue of the best time. We all know the deep-sea submersible, this way to rescue deeper than the life bell, the depth of the life bell will not exceed 250 meters, generally in the depth of 200 m. In 1939, the U.S. has been used to rescue the life bell in the 73-meter depth of the "Squaw Ruth" submarine members.