The four grinning morons were pictured inside the trap - which is baited with pig carcasses - in a marina in Port Douglas, Queensland, Australia.
One of the men even climbed on top of the cage to close the gate - trapping the others inside.
The pictures emerged just a week after it was reported that the grisly remains of a woman who disappeared after wandering out of a care home were found inside the stomach of a crocodile.
Tragic dementia sufferer Anne Cameron's walking stick was discovered in dense Australian bush where the killer reptiles are known to lurk, sparking a massive croc hunt.
The Department of Environment and Heritage Protection (EHP) is now investigating the "stupid and reckless interference".
A spokesperson told ABC: "These traps are specifically designed to attract crocodiles and they are deployed in places where a problem crocodile is known to be present.
"It is extremely dangerous to interfere with a crocodile trap, regardless of whether or not there is a crocodile within.
"It is not an exaggeration to say that interfering with crocodile traps can be potentially life-threatening for the person concerned."
Environment Minister Steven Miles added: "You've got grown men swimming in a crocodile trap, exactly where we put the bait for the crocodiles.
"The trap is dangerous in and of itself, and of course if the crocodile were to appear that would be even more dangerous."
The Department of Environment has also warned of an increase in crocodiles and other predators after recent heavy rainfall and flooding.
