gnug – probably some kind of mine detector/detonator, and probably sometime in the 50s.
As to the "Duck", what a tribute to the imagination/skill/prowess of the 2 parties: Ben and his spouse and the guys who designed/manufactured the vehicle.
Boggles the mind.
Prior to this, the wildest (craziest) voyage I've ever heard about was a local guy who spoke to our Rotary Club some years ago about sailing to Hawaii.
(Relatedly, I have a pal who, to satisfy a lifelong dream, sailed to Hawaii in his 75 ft schooner . . . 75 foot! It was such a terrifying voyage (12 days of gales) that he and his co-owner hired a crew to sail the vessel back to SF)
Now to the Rotary speaker. He got a call from a boyhood chum who asked him if he'd like to sail to Paradise (loosely constued). Both had only sailed on LAKES prior to this harebrained decision. The "boat" – are you ready for this – was 14 ft. overall. Kinda, sorta modified. But, teensy-tiny nevertheless, and after some "practice" in San Diego harbor – now there's a test bed, if I ever heard of one – off they went.
I forget how many days . . . over 40 I seem to recall. The key factoid: They were not too experienced (so to speak) in the fine points of navigation, Fortunately for them they encountered a supertaker about 500 miles from Hawaii, whose skipper was astonished to encounter such a craft afloat there. He somehow paused midocean to render (presumably unneeded) assistance. The intrepid sailors told the tanker of their course. From that they received a "suggestion" toward correcting that course just a tad, which unchanged would have had them miss the Big Island by 400 miles and sail on into the trackless Pacific beyond. And "real" Paradise!
Never unestimate the ability of Man to . . . .!