Here is a really interesting use of a large vessel as accommodation for offshore workers. This is an American craft with a load of cabins built on the afterdeck, providing accommodation for 267 people and a "walk-to-walk gangway. Unusually it was actually built as a dive support shipping 2008 in the Netherlands. It was Marine Link's "Boat of the Month" in 2014. Records indicate that its first job was supporting a deep water development in the Gulf of Mexico, but this photograph was taken  offshore Brazil. 

Photograph taken the other day by Jan Plug and posted here on 25th Septement 2019