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In a post-apocalyptic world where the surviving people are forced off the land onto the water in ships, how would this work? How long can a large set of people survive on a set of boats without support from land? Could large floating colonies be built (that would easily separate in the event of a storm or attack)? What would be the greatest danger to this colony?

Edit: The boats/ships will vary in technology and crowding.

Technology will be whatever can be carried off the land.

There will be some haste, but some will have been prepared. Some will have even possibly known ahead of time what was about to happen.

The people are mostly sane with a mix of crazies and deranged. Some will go crazy over time as resources decline.

One more thought. Some people (very few) remain on the mostly unlivable land. The question is, are they better off or not?

For the sake of discussion, the catastrophe that devastated the land killed most living things over a 3 to 6 month span. Small pockets of vegetation, humans and animals survived. It did not spread completely into the oceans, but did have some effect there.

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    $\begingroup$ What technology is available and what ships are used? Also what do you mean with floating colonies? $\endgroup$ – Soan Jan 14 at 20:03
  • $\begingroup$ How much warning did the people have? Did they have time to build ships with sustainable systems and stockpile resources? $\endgroup$ – Stephen Jan 14 at 20:24
  • $\begingroup$ In my mind, there was haste, but some people were prepared. I should have included that. That will be the 'strategic' advantage. In theory, those people are the new 'rich'. Part of the story in my mind is the flipping of poor and rich. $\endgroup$ – iLWR Jan 14 at 21:25
  • $\begingroup$ Floating colonies implies that groups of boats/ships are grouped together for mutual benefit. There would be competing colonies or groupings and different political and social orders in each grouping. Technology would be modern. $\endgroup$ – iLWR Jan 14 at 21:27
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    $\begingroup$ Why is the land "unlivable"? It seems to me that a ship will be no more livable than a barren rock would be. So you might as well live on the rock. Unless there's something like radiation in play. $\endgroup$ – GrandmasterB Jan 14 at 23:17
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That idea is explored on the old movie Water World from 1995. Your main challenge is metal and wood are going to decay. How to obtain more materials to replace those is the real challenge, or your sailing vessel will sink. Motor powered ships are going to run out of juice with no option to restock. (Unless you farm whales again for oil.....!)

Water you can collect from the rain. Bones from fishes can be used for tools. Skin from different animals has variety of uses (original sandpaper was a piece of shark skin).

So you cover short term and mid term survival. Your home stays afloat, water to drink, food to eat.

Your most valuable tools such as compass will be impossible to recreate without new metal. Every time a spyglass sinks, the world can not recreate it. Every piece of glass that is broken by a storm, can not be re crafted.

A battle of attrition until all your high end technology goes the way of the dodo.

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The greatest threat would be dehydration.

Depending on the tech level, there are certainly ways to procure fresh water while out to sea (I'm going to assume you're not talking about living on large freshwater lakes). Desalinization, rainwater catchment, and dew collection are all viable sources of potable water. Like with real-life live-aboards, they would use seawater for most cleaning and sanitation.

The problem is that "post-apocalyptic" and "forced off the land" imply haste. Are there enough boats for everyone to live comfortably? What kind of supplies are there? Enough water stored to last for a couple weeks at least? Is there water procurement equipment on board, or will they need to create that?

Except in very dry climates, dew collection is super low tech and easy to do. Just use a tarp, something to hang it just so, and a bucket. Times however many people you have. More info here on dew and rain catchment.

This only works if you have tarps or other collection/condensing items and buckets/bowls/etc. And storage if your collection is not daily.

Your second biggest threat is sanitation/disease/toxicity.

That lovely rainwater that fell down? Filled with God knows what. In our current world, even rain in the middle of the ocean comes down with chemical residues from air pollution, bacteria, etc. Plus whatever you pick up from your catchment system and storage. Mostly, fresh rainwater is pretty safe to drink...but in your world? Who knows?

Toilet waste is pretty easy to deal with. If the boats have toilets, just open them to the ocean (they flush with seawater). If not, people can hang out relevant parts overboard or use pots and empty them. Saltwater should be a pretty good way to clean pots and hands. But none of it is perfect and a waste-spread disease will spread. There won't be toilet paper or showers, though people may be able to bathe in the ocean or with ocean water.

Close quarters will spread diseases of all kinds.

Food preservation problems will also cause disease. You can't catch and eat everything fresh every day. There's too much humidity on a boat to dehydrate foods. Some boats have holds for live fish, most don't.

Toxicity is an issue in our current world. My live-aboard friends tell me they never swim or fish or harvest seaweed from where their boat is docked (in multiple locations too). That's where city water drains to the ocean and then there is waste from the other boats (they're not supposed to dump there but...).

I havent been able to take my kids to the beach since we've been here. Coliforms haven't been less than "dire" even once. Plus MRSA, plus flesh eating bacteria, plus brain amoebas...We get raw runoff from Houston sewage plants every time it floods, which means every time it rains...Chemical plant "spills" happen weekly. (Quotes from friend when living in a marina well south of Houston)

In a disaster that includes torrential rains (Harvey for example), everything gets a million times worse. And in your post-apocalyptic world, those sewage plants aren't running anymore. Even if no one is left on the land to create sewage, there's still tons of it left. And it's all pouring into the oceans. Goes out pretty far too. And is carried by currents all over the world (like plastic).

Most factories and energy suppliers are by the coast or a river that drains to the coast. Without people to staff them, a lot of crud will go into the ocean (heck, even with people to staff them).

Oil rigs in the ocean may start to spill over.

Air flow picking up residues from explosions and spills and open pits of waste will travel the oceans too.

None of this takes into account the exposures to bacteria, viruses, heavy metals, and misc toxins during the apocalypse and in the time afterwards before getting on the boats. Or the boats being in the harbor waiting to load up and leave, then navigating to then away from the immediate coast.

Other threats include:

  • Food. Seafood and sea vegetables forever. Yea. But do they have the tools to catch, store, and prepare it? Is it safe from runoff/air quality? Is there a consistent supply?
  • Each other. How crowded are these boats? How deranged are the passengers?
  • Storms. No more GPS or radio updates.
  • Lack of repair parts. Especially for sails and rigging, which is the only way to move the boats once fuel runs out, which it will quickly. You can't row huge boats.
  • Lack of knowledge about the boats. They are more complicated to maintain than most people think.
  • Lack of building supplies to make floating platforms or whatever.
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  • $\begingroup$ A lot of good points and thoughts. Thanks for your time. $\endgroup$ – iLWR Jan 14 at 21:38
  • $\begingroup$ I will note that you've edited the question to address much of my answer. That's fine, I just wanted to point it out for other readers. $\endgroup$ – Cyn Jan 15 at 0:50

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