'Iran oil tanker attack': What does the video show and could it destabilise the Gulf?

A  motor launch bobs up and down precariously, its crew men looking tiny next to the towering super tanker. 

As the boat pulls alongside, a crewman standing on the prow raises both hands above his head and appears to yank something heavy from the hull of larger ship. As he places it on the deck of the boat, several fellow crewmen gather around. The vessel pulls gently away. 

According the the US military, this grainy footage is the moment an Iranian patrol boat was caught removing an unexploded limpet mine from one of two oil tankers rocked by mysterious explosions on Thursday. 

The footage deepens the mystery surrounding the attacks. Who carried out the attacks, how they did so, and why?  

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