The price for a personal submarine starts at about $1 million. The market has grown alongside the jump in wealth for the top 1%, and a drop in the average age of today’s millionaires. Submerged time, payload capacity and maximum depth can greatly affect the cost of a private sub, and custom submersibles with all the bells and whistles can easily reach into the tens of millions. In no particular order, here are seven of the best personal subs for megayachts available on today’s market.