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The crew working on a Manhattan subway line extension encounters problems as they prepare the final few blasts to complete a giant cavern; the West Tunnel mole gang keeps running into obstacles while trying to mine 25 feet a day.

Sandhogs

A Band of Brothers

The moment of truth arrives for the crew using the Roadheader; disaster nearly strikes when the giant machine pierces a water line; a sandhog goes AWOL; tension builds between Jared and his father, Walking Boss Martin Hostetter.

The Roadheader

A rock face at East Side Access is packed with dynamite to clear crossover tunnel space for the Roadheader, but a meltdown at Grand Central Terminal causes a delay; frustration builds on a subway line gang; dangerous undetonated dynamite is found.

Meltdown

Walking Boss Morgan Curran and his gang work to complete the new tunnel's connection to the 118-year-old New Croton Aqueduct; while pouring concrete, clogs slow progress; injuries strike the crew; upgrading the Long Island Rail Road.

Job Security

The Croton crew has little margin for error as they close in on their goal of mining 3,745 feet; a rookie sandhog working in Manhattan commits a gaffe known as "hanging a steel"; tricky double explosion; a man is hurt by a mammoth machine.

3745 Feet

After 38 years of work, a Manhattan water tunnel said to be the largest public works construction project in the history of the Western Hemisphere nears completion; the subway expansion reaches a milestone; blasting problems.

The End of an Era

Morale sinks to an all-time low as the tunnel-boring machine cuts through Croton's upper tunnel; Temporary Foreman Anthony Aviles' aggressive leadership style forces Walking Boss Morgan Curran to monitor the worrisome situation closely.

It Is What It Is

The crew prepares for the project's next step of permanently joining two tunnels; the newly appointed foreman pushes his mole crew too hard; a solo blast in Manhattan.

Leaders Among Hogs

Sandhogs conduct test blasts as construction of the first new subway tunnel expansion in 20 years begins; a foreman loses fingers in an accident.

Punching Through

Walking Boss Morgan Curran and sandhogs of Local 147 tunnel beneath New York to complete the Croton Filtration Plant, a facility designed to help ensure the safety of the city's water supply.

What Lies Beneath

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S1 E4 | It Is What It Is