What do you want to be when you grow up? A baseball player? A doctor? A blogger (LOL)? How about a badass who carves caves through the Earth to improve the lives of millions in America's greatest city? That sounds pretty heroic. And right now, hundreds of hard hat-wearing workers are tackling that grand task underneath New York.

We've seen plenty of photos depicting the incredible process of building the new Second Avenue subway line, but the new ones never cease to amaze. The latest series released by the MTA show the latest progress on the years-long construction project. While the images of cavernous tunnels, some of them coated in yellow tarps, are definitely familiar, some of the candid images of the workers are nothing short of valiant. [BLDGBLOG]

All photos via Flickr / MTA under a Creative Commons license