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Semi-submersible crane vessel - the specialist heavy-lift class. Sleipnir (Heerema, 2019, 20,000t twin-crane, the largest in the world), Thialf (Heerema, 14,200t), Saipem 7000 (14,000t). Distinct from the semi-sub heavy-transport class (which does not install; only carries). One-of-a-kind assets commanding day rates $500k-$1M+.