Hi Doug,
If I was to make the flip ship I would have to do some serious modifications to Big Blue first to increase the depth LOL.
I like the idea of the Duck lift, maybe a bigger version for Swans.
Martin555.

Saw a docu about this ship a coupla years or so ago on Nat Geo channel.
Started me thinking as well.
With all your experience of WTCs and dive systems should be walk in the park for you👍
I decided instead to look at the semi-submersible Big Lift ships, possible application as boat rescue ship on the pond😉 Doug 😎
(Or sneak up under a duck! 😁😂)