I just realized:

there were at-least-2 different designs for that kind of long-term-deterrent.

The spikey-stuff version, & the ominous-maze ( or however it should be called ) version, & maybe another..

That spikey-stuff version could be destroyed-removed by people who found the signal to be the problem, much more easily than the ominous-maze one could.

That may affect future lives..

( of course, my idea that simply putting the stuff DEEP into the ocean-floor right before a subduction-zone, to have plate-tectonics remove it from our surface, would bypass all that, but pick the best method, not the prettiest idea, right? )

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