The Monster That Challenged the World
1957 · Film · 84 min
Directed by Arnold Laven
Giants Mollusks are released from the earth by an earthquake and start killing people.
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For me, it would be because of a great ("great" as in Ed Wood style film-making) movie "The Monster that Challenged the World" (even the title seems low budget).
https://www.imdb.com/title/tt0050722/
tl;dr "An earthquake in the Salton Sea unleashes a horde of prehistoric mollusk monsters. Discovering the creatures, a Naval officer and several scientists attempt to stop the monsters, but they escape into the canal system of the California's Imperial Valley and terrorize the populace"