What is unrestricted
submarine warfare?
provide an example

Unrestricted submarine warfare is a type of naval warfare in which submarines sink merchant ships and tankers without warning. I don't know what you want for an example, but Germany used it in World War 1.

the correct answer is "hematoma formation, with ligaments that are stretched, partially, of fully torn" ankle sprain are produced by an injury to the tough bands of tissue (ligaments) that surround and connect the bones of the leg to the foot. this causes several damage to the ankle including hematoma formation and ligament injury .