I buried one under gravel once, by lowering it a bit. It did not get
exposed again. (I was unlikely to want to get to it ever again anyway,
since it was access to a large surface water drain pipe (1m diameter)
that run under mine and several adjacent front gardens). Every property
seemed to have a manhole access to it, even though it was nowhere near
where any pipes connected to it. I just lowered the original cover.
--
Cheers,
John.
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