Worldwide salvage capacity isn't up much. Mammoet Salvage and Titan Salvage exited the business a few years ago. Smit is one of the few salvors with worldwide reach and their own heavy equipment. The business requires huge equipment on standby, and trained people waiting for the next crisis.
Smit is now part of Boskalis, which is a big marine engineering firm. They have dredgers, heavy lift ships, tugs, and barges, which are useful both for marine construction and for salvage. So the fleet can do other things between crises.
That feels like the kind of non-obvious claim that should come with a source (even just a blog post by an analyst that lays out the relevant vocab terms and the general theory).
Smit is now part of Boskalis, which is a big marine engineering firm. They have dredgers, heavy lift ships, tugs, and barges, which are useful both for marine construction and for salvage. So the fleet can do other things between crises.