Amtrak gives inside look at East River tunnel project to repair damage from Superstorm Sandy

MIDTOWN, Manhattan (WABC) -- Amtrak gave an update Wednesday on a massive repair project that could impact thousands of commuters on Long Island.

Two of the four East River tunnels connecting Penn Station to Long Island are undergoing major reconstruction after damage from Superstorm Sandy.

The repairs have been ongoing for six months and raise concerns about LIRR delays.

Deep below the streets of Midtown, a small army of workers toil 24 hours a day, seven days a week.

Their mission is to demolish, repair and rebuild a pair of tunnels damaged by Sandy.

They are lines owned by Amtrak, but also used by legions of Long Island Railroad and New Jersey Transit riders who travel in an out of Penn Station each and every day.

"Inside these bench walls are conduits that were holding the elect