Lightweight vehicles will set you back about $2M
                                
                                
                                    (Newser) -
                                    These days, anyone can experience the thrill of a submarine ride—provided they've got $2 million to spare. Several companies have sprung up selling lightweight, private submarines to the wealthy: There's the Deepflight Super Falcon, built in California by Hawkes Ocean Technologies, for $1.7 million, or the...