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>The door in the underground shelter will be constructed out of metal and filled in with concrete—a style common in bunkers and bomb shelters. There's some nea

by sigmar 3y ago

>The door in the underground shelter will be constructed out of metal and filled in with concrete—a style common in bunkers and bomb shelters. There's some neat details in this. Really curious how a door like this opens. And curious about the purpose/logistics of a 320,000 gallon water tank. If you have independent power you can just pump well water or filtered ocean water, yeah? Though maybe "external water sources are irradiated to an extent that distillation/filtration are impractical" is part of the design spec...

throwup238 3y ago
It's utterly moronic. Those bunkers and bomb shelters are made to withstand air raids and nuclear bombs, not ground assaults. There is zero chance anyone is spending any resources on bombing a tiny island with a population under 100,000, but those locals? The first thing those locals are going to do if society actually breaks down is find those water and air intakes (that they built!) and shut them down. The latter by lighting a garbage can full of plastic on fire and flushing the inhabitants out. If they actually have an active life support system with CO2 recycling, the locals will just destroy the bunker from the outside because... well... we've been quarrying giant blocks of rock for thousands of years. It's not that hard when you've got unlimited physical access. Even the steel door is a minor barrier when you don't have fortified towers or parapets to defend from. The question is whether the island has enough explosives on it or whether the locals would have to boat over to a bigger one to borrow some. If not, a cheap jack hammer would make quick work of the bunker but even if they were reduced to wood fires and a single pickaxe it wouldn't take more than a few weeks to pick the structure apart using prehistoric techniques: https://en.wikipedia.org/wiki/Fire-setting https://en.wikipedia.org/wiki/Fire-setting
0xbadcafebee 3y ago
> Really curious how a door like this opens. If it's just a standard blast door, captured hinges with grease. You just pull it open, and a cam pulls it closed tight. If it's a sliding door, you can use bearings, cams and screw gears. For very large doors that swing open they'll still use captured hinges, with hydraulics to actuate it, but humans can still close it themselves. > And curious about the purpose/logistics of a 320,000 gallon water tank. The same purpose as towns that have water tanks. You'll still pump water into the tank slowly, but you need a much smaller pump capacity to slowly fill it. And it's way more efficient to distribute the water using the force of gravity; it would be very difficult to distribute lots of water at the speed needed to maintain adequate water pressure. The tank's excess capacity allows you to service peak usage easily, and operates in the absence of electricity. Work smarter, not harder.

by sigmar 3y ago

throwup238 3y ago

It's utterly moronic. Those bunkers and bomb shelters are made to withstand air raids and nuclear bombs, not ground assaults. There is zero chance anyone is spending any resources on bombing a tiny island with a population under 100,000, but those locals? The first thing those locals are going to do if society actually breaks down is find those water and air intakes (that they built!) and shut them down. The latter by lighting a garbage can full of plastic on fire and flushing the inhabitants out. If they actually have an active life support system with CO2 recycling, the locals will just destroy the bunker from the outside because... well... we've been quarrying giant blocks of rock for thousands of years. It's not that hard when you've got unlimited physical access. Even the steel door is a minor barrier when you don't have fortified towers or parapets to defend from. The question is whether the island has enough explosives on it or whether the locals would have to boat over to a bigger one to borrow some. If not, a cheap jack hammer would make quick work of the bunker but even if they were reduced to wood fires and a single pickaxe it wouldn't take more than a few weeks to pick the structure apart using prehistoric techniques: https://en.wikipedia.org/wiki/Fire-setting https://en.wikipedia.org/wiki/Fire-setting

0xbadcafebee 3y ago

> Really curious how a door like this opens. If it's just a standard blast door, captured hinges with grease. You just pull it open, and a cam pulls it closed tight. If it's a sliding door, you can use bearings, cams and screw gears. For very large doors that swing open they'll still use captured hinges, with hydraulics to actuate it, but humans can still close it themselves. > And curious about the purpose/logistics of a 320,000 gallon water tank. The same purpose as towns that have water tanks. You'll still pump water into the tank slowly, but you need a much smaller pump capacity to slowly fill it. And it's way more efficient to distribute the water using the force of gravity; it would be very difficult to distribute lots of water at the speed needed to maintain adequate water pressure. The tank's excess capacity allows you to service peak usage easily, and operates in the absence of electricity. Work smarter, not harder.