The “submersible thing” smells strongly of a grift. He was very likely siphoning the funds from it, funneling them to his wife’s “nonprofit” or just into his own pockets. Look at the “sub” itself and just how bare bones it was. He didn’t employ shitskins and women because they were “inspiring;” he did it because they were cheap, and he cut corners in dozens of other areas. Then the business closed when the sub imploded “with him onboard,” and it’ll almost assuredly come out later that the company had been “shockingly” bordering on bankrupt for some time because of the Rush’s “starry eyed incompetence,” but since he’s “dead,” no criminal inquiry will occur. With no further investigation and the money vanishing with him at the time of his “death,” he can take up residence in Tel Aviv with frequent visits to whatever latest iteration of Epstein’s Island.