Cussler novels are always a riot, but Atlantis Found is one of my absolute favourites.
Canadian Amazon link if you're interested: https://www.amazon.ca/Atlantis-Found-Dirk-Novel-Adventure-ebook/dp/B001JTPXTY/
Without spoiling too much, it's about a marine engineer named Dirk Pitt (you might know him from the movie Sahara, which was based on the book of the same name) who tries to unravel the mystery of weird skulls and ruins. Also big baddies. And the Skycar. And many other awesome things.