Super-large air-hole torpedo is a kind of torpedo propelled by rocket, which can be wrapped in a bubble with almost no friction and sneak at high speed. The appearance of torpedoes will change the old submarine strategy. This new torpedo is more flexible, less noisy and less easy to be discovered by the enemy.

It can be equipped with conventional warheads, nuclear warheads or even no warheads, because its mass of more than 200 kilograms and speed of 370 kilometers per hour can cause enough damage.

The most difficult problem of this torpedo is not power, but how to reduce the resistance of seawater. It is necessary to make bubbles to wrap the torpedo outside, which is supercavitation technology.

Gas is ejected evenly from the torpedo head, which is powerful enough to form bubbles around the torpedo. According to the supercavitation theory, the higher the speed of the torpedo hidden in this big bubble, the smaller the resistance from the seawater. The range of this torpedo is similar to that of traditional torpedoes, about 9 kilometers.

This concept was first put forward by the Soviet Union during the Cold War. After years of efforts, a supercavitating torpedo named shkval has been put into the market. Shkval torpedo can directly hit the target, but the United States has made further improvements on this basis, so that it can turn, identify the target, and track the target through signals, radar and so on.