I run a bank on a (VANILLA / SURVIVAL) server. Now currently it's just an obsidian covered room with 1 entrance and an iron door. It would take 5-6 seconds for someone to walk to the back and click the button and open the iron door and steal everything. How would I make a more secure vault?
There are alot of measures you could take to make it "more secure". but just knowing that its minecraft, Anything will be possible to be broken into or even entered UNLESS. You use Command Blocks to perhaps make it kick ANY Player near it to teleport away. Who knows.
Have multiple layers of obsidian (I would suggest 4-6) w/ a 2 block lava "insulator" in between the obsidian layers. Make the entrance to the vault hidden (hide it behind a single layer of obsidian to fit the walls. If you have a good pick, it shouldn't be too hard to tear it down when you need to). Make the vault itself hidden (hide it in an area no one would expect, instead of the middle of the bank).
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"I know there are people in the world that do not love their fellow human beings, and I hate people like that."-Tom Lehrer
My favorite way of hiding things is a secret piston door in the floor. Make a "back room" to your bank where people can't physically see you. One block on the floor has redstone under it that opens the vault door. Only you know which block it is. When you need something, place a lever on that block and activate it. Do your stuff in the vault and make sure you destroy/pick-up the lever again as you leave. That way no one will know which block opens the door. You can combine this plan with the obsidian container to make it harder to tunnel into.
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How about a multi obsidian layered vault (10 layers)? Maybe using a redstone lever password lock that can be repaired if the levers were removed? And maybe it could be on top of a huge lake of lava with a secret entrance inside the lake (requires something to help you resist fire) the exact location of which only YOU would know of.
I know it's a bit extreme but you want to make your vault as unappetizing as possible...