Crypto investors are turning to Military grade vaults to safeguard their Keys. While some prefer to know the Keys by heart, some have their crypto stash in physical dedicated crypto wallets like Trezor and pay big money to have them stored in Nuclear sheltered safe vaults. Take for instance
Swiss Crypto Vault who offers Nuclear sheltered vaults to crypto investors. if you had 2000 bitcoins what options would you pick?
It's probably too much to hide your seeds in an anti-nuclear vault, I don't have many bitcoins but enough to keep them in a trezor and hidden in my private room, so I don't deserve to have a safe and keep it in a place that no one else knows.