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Discovery Channel is promising to go where reality television has never gone before: inside the mouth of an anaconda.

The December premiere of “Eaten Alive” promises to show filmmaker Paul Rosolie being swallowed alive by a giant snake, after covering himself in pig’s blood while wearing a custom-built suit.

“You have to go head-first,” Rosolie says in a clip promoting the program.

The special has already been filmed, and the filmmaker – and snake – are believed to be OK.

Critics have voiced concern, wondering whether the snake was harmed during the filming, but Rosolie defended the program.

“If u know me – I would never hurt a living thing,” he wrote on Twitter.

“Eaten Alive” marks another “shock” reality program for Discovery Channel, ... and “Tethered,” with strangers bound to each other while participating in survival challenges.

GORDON wrote:How the hell do you get a human that has been swallowed by a snake out without cutting the snake open?

GORDON wrote:I thought their back-curving teeth would prevent regurgitation.