 I think the Chinook CH-47 is around 15,000 horsepower, just a tremendous amount of horsepower behind him that he had to quickly subdue. He dove in, and he noted that he tried to dive at least three or four times, but the saltwater was so buoyant that it kept pushing him back up. But after the fourth time, he kept diving further down, and as he popped back up, he can feel this.