Vijay was a human woman serving time in an underwater prison pod. She had two daughters at home, and she was afraid that trying to escape would lead to a longer punishment.
She had served two years of her ten year sentence when the Third Doctor and Jo Grant arrived in the pod. Like the other inmates, she was initially suspicious of them. The Doctor convinced her that he intended to get them out of the pod, though he wouldn't free them.
Vijay took one of the shifts on the exercise bikes to provide the power the Doctor needed to free the pod from the ocean floor. When the pod floated to the surface, Vijay and the other prisoners saw the sun for the first time in years. (PROSE: Deep Stretch)