Sea Critters

[Armchair detective]

Way back it was pointed out that if you have a tunnel open to the ocean, all kinds of sea life would migrate into the tunnel and make a home there.
Funny thing, that. There's been no mention or sightings of any such in explorations underground anywhere.
Is this the purpose of the filter system on the beach?
Could it be?

 

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[TruthbeTold]

Since it was proven long ago that flood tunnels never existed, the reason is obvious.