Using ballast tanks that allow it to sink, the Boka Vanguard can lift enormous loads at sea weighing tens of thousands of tons.
See here how it works.
See how this strange ship lifts a cruise ship in the middle of the sea | Video | CNN
2021-09-24T11:27:37.951Z
Using ballast tanks that allow it to sink, the Boka Vanguard can lift enormous loads at sea weighing tens of thousands of tons. | Economy | CNN