One of my favorite movies as a kid. I loved James Arness with his Thompson and the grizzled old scientist telling him where to hit the ten foot ant to kill it. We lived in SE PA. but used to drive out west to visit relatives near L.A. every year. I loved those dry concrete storm drains after seeing the movie for the first time. And I could make the keening ant cry too which creeped out my cousins.
Some of the free movie channels are good for watching classic sci-fi b movies.