Israel and terrorist swimmers

There have been several attempts by swimming terrorists to enter Israel and sow havoc. In recent years, these efforts have not been successful as noted
herefrom a 2004 event:

Israeli soldiers killed two armed Palestinians dressed in diving uniforms who attempted to infiltrate a Gaza Strip settlement from the coast, the army said yesterday, the latest in a series of failed attempts to avenge Israel's assassination of the Hamas spiritual leader.
Initially, the army said three Palestinians had been killed. After searching the area in daylight, a spokesman downgraded the death toll, saying only two bodies were found near the Tel Katif settlement.

The two militants -- who opened fire on an army outpost guarding the settlement shortly before midnight Thursday -- were wearing diving uniforms, and flippers were found thrown on the coast, the army said. The men were armed with assault rifles and rocket-propelled grenades, the army said.

In August 2002, militants also attempted to infiltrate from the sea the Dugit settlement in the coastal strip. The militants were killed before they reached shore.

I suspect Israel is well aware of the threat and closely watches its shores.