Yes, someone did say Giant Sea Scorpion, in this twitchfilm.net post about director Brian Yuzna's latest offering, Amphibious 3D!
Promising "old-school" horror, as opposed to the crap CGI of Asylum pics I imagine. But here is an odd statement: "On the whole the film looks like a remarkably faithful updating of the sort of exploitation grinders produced in Indonesia en masse in the 70s and 80s."
Umm, I've never heard about Indonesian exploitation movies, let alone seen one. Sounds like it's time to troll the net for clips of Indonesian monster exploitation movies of the 70s and 80s. Hopefully there's a giant crab monster or two in the mix. And they send the Navy from their base in Guam, after finding a note in a coconut.