I seem to recall a post here somewhere that a jet fuel tank was located under the helideck. The helideck is melted in a square pattern. Somewhat shaped like a tank. Our old Jet A tank was small and cylindrical with typical convex ends. <=>
In reference to the DWH derrick. I saw a great deal of vertical ladder caging, backscratcher, on the rig rov the other day. Couldn’t determine where it should have been on the rig though.