When the submarine came into view, Xiang Shan commanded the buoyancy device to detach from the slot on his body and used the joint of a prosthetic leg to clamp the chain connecting the buoyancy devices on both sides.
If this buoyancy device wasn't attached to him, but rather as an external equipment, it could be used as a fulcrum. With such a tool, he could exert force better in the water.
It's precisely for this reason that Xiang Shan didn't discard the buoyancy device to sink straight down.
Small white dots suddenly appeared in the seawater. Xiang Shan knew they were traces of supercavitating torpedoes. He immediately raised his hand, using electromagnetic force to drive a solid steel bullet to intercept them.
