Editor
Charles Kohnen, co-founder of the submersible manufacturer SEAmagine Hydrospace, estimates that there are 200 manned vessels worldwide. Some are used by scientific institutions, others for tourism. But a growing number belong to a select group of yacht owners.
While a ticket aboard a submersible tour, like the one that ended in tragedy this year en route to the Titanic shipwreck, is too pricey for most people, owning a submersible requires…
