Heavy Rescue: 401

A semi-truck crash shuts down a crucial border route; rookie heavy rescue driver Sonny helps a trucker stuck on a dangerous stretch of highway; a tanker wreck causes commuter chaos in Toronto.

Rookie Sonny faces a 40-car pile-up that turns a major highway into a war zone;a fierce storm triggers a triple-semi crash; a father-son team race to clear the road as weather blasts in.

A courier truck rolls over; a vicious storm puts Mark in the middle of a crash zone; the crew dives for cover during an icy airbag job.

James and Bubba recover a semi smashed into a building; Kevin faces problems with a tractor-trailer crashed in deep mud.

Gary's team fights to upright a battered trailer; a rookie takes his first shot as lead operator on the rotator.

Kyle tangles with a wreck that will prove if he's got what it takes to lead the team; Sonny heads to the scene of a violent jackknife.

A whiteout pile-up scatters heavy I-beams across the highway, testing James and his crew; Kevin must lift a 20,000-pound chunk of steel off the road.

During a spring storm, Steve cleans up a fuel spill blocking the 400, while Sonny struggles to keep the alternate route moving; John Allen recovers a loaded semi that went for a wild airborne ride.

Members of the Highway Thru Hell crew join the 401 crew to weigh in on the unique challenges of recovery operations in Ontario and B.C. and compare the biggest wrecks and toughest jobs over the past winter.