Lift Boats are key to deployment of off-shore wind farms.
Submitted by Harold Saive
The lift boat probably had all three stilts elevated more than 40 feet above deck when it capsized.
It appears this necessary configuration would make it extremely unstable even in moderate seas.
When you look at the following frame capture from US Coast Guard video you can see another LB on the horizon.
https://www.blockislandtimes.com/article/unique-boats-coming-block-island/45747