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There's no doubt that making The Revenant was friggin' brutal.

"It was a difficult undertaking because [director Alejandro González Iñárritu] wanted to immerse deep into nature [with] logistically hard places to get to in rough conditions," Leonardo DiCaprio, who plays an 1820s frontiersman out for revenge after he's left for dead when he's attacked by a bear, tells E! News' Jason Kennedy. "But we kind of looked at it as this unique challenge and adventure that we were all on. But we knew we what we were signing up for from the onset.

"The weather conditions made things incredibly complicated," the Golden Globe nominee continued. "We were in sub-zero conditions one day and the next week the entire snow pack would melt so we had to adjust to nature."

Tom Hardy, Leonardo DiCaprio, The Revenant

Kimberley French/Twentieth Century Fox

DiCaprio compared the shoot to trying to climb Mt. Everest.

"It's sort of like a beautiful blur all of this stuff to me because we were there for such a long period of time and nature provided incredible beauty for us to film but logistically it was a very difficult undertaking," he said.

There wasn't much to do during downtime. "We would sit in our homes in the middle of snowy Calgary and we'd have a hot chocolate and lots of great food," DiCaprio said.

"In a onesie," his co-star Tom Hardy joked (at least we think he was joking).

"We got warm," DiCaprio said. "That was our celebration. We got warm."

The Revenant is in limited theaters on Dec. 25 followed by a wide release on Jan. 8.

Click the video below to get more inside scoop in this year's holiday movie season.