She's been down too long, and Clara is frantic, eyes scanning the water until she sees the faintest of movement that's not like the others: bubbles breaking the surface. There's a moment of being terrified, but she grits her teeth and grabs onto a wooden plank that isn't attached to anything. It's not too heavy, and so she wields it with one hand while trying to swim away from her perch of safety.

Batting hands away, she kicks at wrists that snap easily, until she feels fingertips that don't grab at her, but rather brush against her ankle as they sink. Vanessa. There's enough of a path that it's taking time for dead bodies to fill the space again, and Clara dives under the water, swimming down, down, until she reaches blindly and feels skin that doesn't disintegrate to the touch.

Getting Vanessa up would've been so much harder if the skirts hadn't been cut away, and Clara gets her arms under Vanessa's arms to begin kicking upward. Just before her head breaks above the water, she sees a body coming closer and she could swear its the face of the Doctor, and then her head breaks the surface, gasping.

By the time Clara manages to drag them to the bank, she's so exhausted that her arms are shaking. But she still looks at Vanessa, to see if she's breathing.