"undamaged"? You mean aside from a ten year long winter, no sunshine or growing season and lethal doses of radiation for at least five years? Plus the last time I looked...
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Bug-Out Boat.
I, and my Very Significant Other looking over my shoulder, see a lot of off-topic statements.
Meanwhile, a great bunch of possibilities goes unexplored...
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Bug-Out Boat.
We constantly read similar threads on naval architecture and home-builder forums.
We are on the water with other folk, discussing their plans to modify their vessels into Bug-Out capable.
Each of us is continuously 'gaming', playing with 'what-if' possibilities.
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Accordingly, our long-duration full-time live-aboard vessel includes:
* Trailerable -- use it in lakes, rivers, littoral... 8.5' x 53', about the size of a common semi-trailer in fUSA
* Non-plastic -- aluminum (steel was our second choice)
* Low radar and infrared signature
* Engineered for the entire deck to be a photovoltaic structure
* Engineered for the entire deck to be a rain collector, channeling potential drinking water to the tanks
* Electric drive, retractable above water
* Designed from the start for long-term self-sufficiency with a walk-in shop, walk-in freezers, and extensive stores of food and meds, parts and tools.
* Long narrow scow, short-masts, similar to the canal boats of Europe
* Level beach-able to dry out for maintenance while maintaining the live-aboard capabilities
* Redundancy in all systems and crew
* Every crew has multiple cross-trainings, able to mentor newcomers we might consider rescuing.
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Imagine a flotilla of such self-reliant vessels, mutually supportive as a cohesive defendable unit.
Imagine these folk thriving on the bounty of the sea and shores.
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We initiated our sea-faring in the 1970s, then discovered SAILING THE FARM, discussing the use of every window as part of an extensive green-house... and the many benefits of sea-vegetables.
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All three of us grew-up on farms, so isolated rustic self-sufficiency is normal for us.
But none of us are managers or administrators.
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Irregardless of catastrophe or disaster, our prep is good for probably most any event.
Our water filters are good for a volcano or tsunami or earthquake event.
Our freeze-dryers produce food good for droughts and floods.
Our security is adequate for rioters and other nincompoops.
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Two of us are current with our Combat Medic skills, one of us is a retired USAF Para-Jumper experienced in surgery, with a specialty in containing potential epidemics.
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Between going way-overboard 'gaming' the most extreme cascading disasters piled stop catastrophe after catastrophe -- tsunami in a blizzard with contagious rioters -- we use our boat to verify its compatibility with our needs.
The size and shape only remotely resembles the original.
The interior seems to be hacked out and fussed with at least a couple times a year.
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This is our vessel.
These are our plans.
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We would enjoy reading about your prep and plans!