In the late 90’s Bas Rutten was fighting Pancrace in Japan and he was famous for one move: the ‘Bas Rutten’ neck crank.
It’s a simple move that consists of controling your opponent in kesa gatame/scarf hold but instead of just holding and arm, you reach for the near leg and squeeze for dear life.
The pressure is tremendous and since your hand are holding on to your thighs, you are using the strength and your arm and legs at the same time to squeeze your opponent is squeezed in like a pretzel. They have no other than to tap or face a broken neck.
Here is Bas Rutten successful with this move in Pancrace:
Bernardo Faria discusses if this technique is legal or illegal under IBJJF rules. For some people, this is a diaphragm compression, and others see it as a neck crank:
If you want to learn escapes from everywhere and add a layer of confidence to your bjj game we highly recommend Submission Escapes by Tom DeBlass: