Scientists captured a stunning photo of two glass octopuses intertwined. They might be having deep-sea sex.

• A deep-sea expedition caught a picture of elusive glass octopuses.
• The nearly-see-through creatures were intertwined, which could mean they were mating. Or fighting. 
• It was taken on an undersea expedition, which may have uncovered four new octopus species. 

A deep-sea expedition captured a picture of the elusive glass octopus, an almost completely transparent creature.

The picture shows several of the rare octopuses, formally known as Vitreledonella richardi, closely enlaced.