The Canadian-born Cameron is considered an expert on underwater filming and remote vehicle technologies.
This appears to be a "legitimate" connection Cameron has to the entire thing, so it's not like actors called before congress testifying about issues in which they played roles in films or tv shows. Or district attorneys (yes, you, Waterston).
But to be blunt, Cameron is still an amateur compared to REAL search and rescue teams, such as Navy submarine retrieval units or the late Red Adair's organization, neither of which are part of the mix.
As I said before, though, the entire process is being orchestrated for maximum favorite results for the Democrats. Nothing else matters to the administration.