4 on 4 off as a staff member is rapidly becoming a thing of the past mostly due to there being no staff at most of the companies in the industry,
I have worked for Sonsub, via agencies, in the past and they have some good points like you get paid on time and the vessels are clean. Spares support was not to bad.
I stopped working there after a trip on the s7000 which you mentioned. A member of the crew lost a finger due to in my opinion unrequired time pressure emminating from the bridge through the superintendant and down onto the team on the deck.
If you do go on the vessel remember the golden rule before going on deck look up, look down, look all around and then repeat.
If you can try and get onto the Normand Cutter or even if they still have it the Mearsk Reliance they are much safer vessels to work on.
I am sure lots of people have enjoyed there time on the 7000 but I would never go back there for sure.
The package Sonsub offers is normally very good and they do seem to retain a lot of staff but I would always take promises of 4 & 4 with a pinch of salt from any company in the industry not just Sonsub
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