What you see on the video is the easy bit. Look at the colour of the water the divers are entering. Diving in nil vis. Guided by laid lines and touch although they would be wearing gloves.
I wonder to what max. Depth of water there was. If over 10 meters Deco. Would be required. Also you can only breath compress air for a limited time as itís so cold and dry, although I did spot a diver wearing what could have been a rebreather diver set but those can creat problems of a different type.
A great job done ! The tidy up will have begun and that will take some time as you cannot leave stuff behind.
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