Who is Commander Rudi Gunn from Mayday! and what is their importance?

Commander Rudi Gunn is commander of the First Attempt, NUMA's boat that is located in the Aegean Sea, off the coast of the island of Thasos. The First Attempt is looking for evidence of a fish that is long believed to be extinct. He is described as a very small, sparse man who is passionate about all things underwater, especially fish. Rudi and Pitt have known each other for a little over a year, and Rudi has learned to trust his instincts.