New York: the greatest city in the world, the city that never sleeps, and home to the world's first jiu-jitsu club in a subway station? 

I have no idea who they are, but a bunch of crazy guys set up shop at 14th Street--Union Square subway station for what they are calling the "Secret Roll Club." 

How secret their little jiu-jitsu fight club really can be when it's right there in the middle of an active subway station isn't clear, as you can see commuters trudging past the grapplers in true New York fashion -- barely a glance at what they're doing and zero F's given. 

To top it off, the jiu-jiteiros filmed their escapades with a head-mounted GoPro -- and to be honest, they busted out some pretty slick moves for a mat that looks about as big as a bath towel. 

Training jiu-jitsu somewhere unusual? Let us know in the comments