This is the Marum Crater on Ambrym Island in the Republic of Vanuatu in the South Pacific Ocean.
This volcano is very active, very dangerous and, reportedly, no one has ever been this close to the business end of the volcano.
But explorers Sam Cossman and George Kourounis wanted to change all of that.
And you thought you were brave by going on roller coasters at Great Adventure, or climbing to the top of the rock wall at I Play America. Well I think this video has you beat. If you're not putting on a heat resistance suit to do an activity, then I'm guessing these guys have nothing to say to you...