Underwater superyachts? A CEO is pitching fantastical ships that can go 800 feet down and stay submerged for weeks
Forget megayachts. Forget billionaire basements. If you're unfathomably rich and want a new toy, there's an Austrian company that says it will build you a fully submersible yacht.The Migaloo M5 concept, the company says, involves a 540-foot base- …