If the sea is still enough to land, it's still enough to take time securing. The previous stage was secured by tying down the thrust structure ("octaweb") to tack-welded fixings on the deck with hoofing big chains. There may also have been shoes, we couldn't see clearly.
Tack-welding fixtures to a steel deck is apparently SOP in big shipping, so it's not as radical as it sounds.
Tack-welding fixtures to a steel deck is apparently SOP in big shipping, so it's not as radical as it sounds.