reason that any tank turret may blow off; the ammunition has caught fire And exploded.It happens more with Russian tanks as the auto loader requires all the ammunition to be stored below the turret ; so when it explodes, it blows the turret off.Most western tanks have The ammunition stored behind the turret or in the turret bustle; if it catches fire and explodes; then the back of the turret blows off; there are blast doors which give some protection to the crew