7:05 the deck needs to remain very flat; if it twisted just a little, inordinate loads on the high section would break the deck.
You can skip ahead to 28:28 in this video - where this ship submerges its deck to take on loads.
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Another concept in shipping - the drag of the anchor rode (chain) on the sea floor creates much of the friction that keeps a ship from moving, not the anchor itself. See 3:00 in
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This video predicts a big future in unmanned ships that can safely deliver payloads to areas of conflict without risking human life. The onboard systems are simpler (no fresh water, heating and cooling, light...) if they don't have to accommodate human crew.
1:52 China has come to dominate world shipbuilding at 53% of tonnage built, while the US contributes a mere 0.1%.
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