Guys, I’m KIND of freaking out… 

It’s Pompeii, Capaldi’s episode.

The Seers in the episode are told to BREATH the mountain ash DEEPLY, including “Capaldi’s daughter”, who is told to do just that in the families introductory scene. 

It’s hot today! A hypocaust on full blast! The mountain God must be happy! Breathe deeply! Remember what the sisterhood said.

Evelina breaths the fumes of the furnace. It is clearly painful.

The first episode it called DEEP BREATH.