Two amorous monitor lizards were caught mating under a factory floor, only for workers to smash open their love nest with sledgehammers on Monday (February 25).

The pair of massive reptiles crawled through a gap in the concrete then snuggled up outside the building in Chachoengsao, central Thailand.

Shocked workers heard strange noises and went to look before noticing the entwined reptiles.

Steel factory owner Pisit Sae-Joong, 27, called the rescue service. They immediately spotted the lizards stuck inside the narrow space.