Photo: Twitter/@kforbes2131

It looked like a hole in the sky, or maybe something out of a science fiction movie.

Fallstreak or "hole-punch" clouds were spotted over the B.C. Coast on Monday.

The unusual phenomena are caused when water droplets become "super-cooled," causing a circular part of cloud cover to turn into ice crystals and fall as precipitation, CTV News reports.

"They're pretty impressive in that you're seeing a fairly large geometric shape all of a sudden in the sky," Environment Canada meteorologist Armel Castellan, explained to CTV.

The striking holes were spotted over Victoria, Nanaimo and the Fraser Valley.

But, don't worry – the aliens are not invading.

– with files from CTV Vancouver Island