Courtesy Triton
The Triton 3,300/3 can take three people more than 3,000 feet under the sea - starting at $3.6 million.
But in a world with no limits, what would you spring for?
Perhaps a trip to space, where you and your family could gaze down at the Earth? A diving session to watch great white sharks rip apart dinner? Or your own hoverboard, for cruising across your own specially designed track?
We've picked some of our favorite super-size gift ideas for science and technology fans (one can dream, right?).
Whether you're interested in exploring the ocean depths or getting your hands on a technology out of a sci-fi movie, there's something here for everyone - with extraordinarily deep pockets.