In photographs and in movies, we often see tanks whose turret has been blown off. It is unnecessary to say that a tank is a serious vehicle, designed to withstand a lot of damage. This alone gives rise to a logical question: how can a tank be torn off a turret? No less questionable is the fact that this does not actually happen with modern tanks. Why?
There are only two most common reasons for the detachment of the tower. Both of them, in one way or another, are associated with serious damage to the combat vehicle. The first reason is quite trivial: a powerful projectile hits a vulnerable spot between the turret and the hull of the tank. Most often this happened during the Second World War when the tank "caught" a shot from some large artillery gun or self-propelled guns. In this case, the impact and (or) explosion is of such force that no structure is able to withstand and the tower breaks down, often throwing it back tens of meters. It is important to understand that incidents of this kind are quite rare.
The second reason is the most common. This is undermining the ammunition storage of a tank with shells as a result of a fire in the car or a direct hit of enemy ammunition in the storage compartment. Undermining the ammunition rack does not always mean a guaranteed disruption of the tower, but the latter most often occurs precisely as a result of this incident. The bottom line is that a huge overpressure forms inside the tank, which in a predictable way finds a way out through the most fragile structural element - the place where the tank turret is attached.
It was only after World War II that the tank's ammunition stowage detonation problem was solved. To do this, knockout panels began to be added to the design of combat vehicles, which should fire in the event of an explosion inside the tank and deflect the blast wave from the compartment with the crew. Before that, tankers had to go for all sorts of ersatz solutions, like driving with constantly open hatches. This made it possible to reduce the pressure of the blast wave inside the vehicle and increase the chances of survival of the crew and preservation of the integrity of the vehicle. Of course, such a technique did not give people a serious chance anyway and worked mostly as a sedative.
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Continuing the topic, read about how the Soviet Union disposed of captured German tanks after the war.
A source: https://novate.ru/blogs/200421/58682/
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