Bored of your superyacht? Time for a submarine — money.cnn.com

Personal submarines are the latest must-have accessories for wealthy yacht owners looking for exciting ways to enjoy the water. A decade ago, so-called "submersibles" were rarely found outside scientific and military circles but private use has spiked over the past few years. The market has grown alongside the jump in wealth for the top 1%, and a drop in the average age of millionaires. "The younger, more adventurous owners want more out of their yacht than just sitting on the back drinking a cocktail," said Graham Hawkes, founder of luxury sub maker DeepFlight.

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