These expedition voyages even allow passengers to venture into the depths of the underwater world though onboard luxury ...

Then, the luxury cruise line launched and began sailing ... My dad and I splurged on the submarine ride, which cost around $899 per person for a 30-minute ride — it was totally worth it.

While luxury expedition cruises can’t take guests into space—yet—they can explore the Earth’s last frontier: the ocean. The Scenic Neptune II submersible Barker explored with is just the latest in a ...