Michael Westen : [narrative] Not all hiding places are created equal. Generally speaking, a good hiding place is hard to find but easy to access. On rare occasions, for the most sensitive material, you have to go a step further and find a hiding place even you can’t get to. (418 - Last Stand)
It’s always a challenge hiding something sensitive that you might need quickly. Any hiding place involves a trade-off between security and access. Hide something in the sewer main under your floor, and it’s secure, but good luck getting to it. Hide something in your sock drawer and it’s easy to get to, but hardly secure. The best hiding places are easy to get to but tough to find. The do-it-yourself versions are known in the spy trade as slicks -easy to slip something in, easy to slide it out. -(Burn Notice Episode 209: Good Soldier)
That first one tho, who has walls that are a foot thick like that, it’s just silly.