Iran has jurisdiction over British warships and sailors in Iran's detention of British sailors? British warships in Iraq ...

This is not a simple question of jurisdiction.

Ships are an extension of a country's territory. Generally speaking, foreign countries have no jurisdiction. However, this lack of jurisdiction is relative. Generally, countries will introduce special restrictive laws against territorial waters to safeguard their own rights and interests. China's territorial sea statement and 1992 territorial sea and adjacent areas all point out that no foreign aircraft or military vessels are allowed to enter China's territorial sea and its airspace without the permission of the people of China and the government of China.

For example, as long as illegal ships and warships infringe upon the interests of other countries, it is no longer a simple jurisdiction issue. "Innocuous passage" is just a noun. Whether it is harmful or not is the focus of controversy and must be combined with specific national laws and regulations.

If a country has no control over its territorial waters, warships of other countries can stop at his door and fishing boats can go fishing at will. You can't control me anyway.

How can a soldier have immunity is at best a matter of jurisdiction.