It's clear Iran wants no more problems with the West than it has. It would be very interesting to know what these folks had been doing, why they were in rubber boats, so far away from support, and able to be captured. I suspect they were up to no good, myself. (Reminds me of uproar over US planes shot down by China in "international waters" during the Cold War.
Some of 'em may have glided out that far, most didn't.)

Hostage fears over troops seized by Iran.

"Britain’s crisis with Iran deepened last night after Tehran justified seizing 15 British servicemen by claiming that they had strayed into Iranian territorial waters “illegally”.

"The announcement appeared to rule out any hope that the incident was a simple mistake that could be quickly rectified.

"Instead, there were growing fears that the 15 British sailors and Royal Marines were victims of a deliberate ambush on the disputed Shatt al-Arab waterway by Iranian Revolutionary Guards, perhaps seeking to use the captives as hostages in the increasingly tense stand-off between the West and Iran over its nuclear programme."

Any "innocent victim" protests by the Brits might have a strong odor.

Arf