There aren't many of these contractors. That's one thing. The other thing, in some cases, is that they don't have an existing or long-term contract.
If there is an emergency and there's no contract open or active with these contractors, they can basically say no. This has happened for us in one particular case with one of our wharves. There was a need to do some dredging right after the storm, and the particular contractor in this case said no because he had something else to do.
Luc can maybe expand on that, but that was a very stressful situation.