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Help me find the name of this movie please!

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So I remember watching this movie when I was younger. I only remember some details. I remember it being a movie where these people got sucked through the sand. It’s an animated movie by the way. I saw a post on Reddit looking for this movie as well and they described it better. It’s this commmunity in a post apocalyptic world where they end up in a desert and get sucked through the sand. They end up in this underground lab. Please help me find this movieeee

VHS_Lives Posted new comment Nov 16, 2020

do you have the link to the reddit question so I can find more details to search with?