Who is faster submarines or submersible?

A submarine is way faster. Submersibles have very small electric motors and are usually placed into the sea from their 'mother ship' very close to whatever they are going to work on or survey. In this way they can reduce moving around a lot. Many submersibles do tasks underwater such as hooking up cables, repairing oil well equipment or searching for something. There is no need for them to be fast or to move very far except down and up, ( and they don't use motors for that )