Nasreen Chaudhry

Dr. Nasreen Chaudhry was a geologist in the year 2020 who, along with Tony Mack, was digging down into the Earth further than any other human had before.

Biography
After Nasreen and Tony had noticed a mineral in the local area that hadn't been seen on Earth for many years, they began drilling there. The digging continued until the Eleventh Doctor arrived and realised that something else was digging up to the surface. This turned out to be Silurians. As the Silurians got closer to the surface, Tony announced his love for Nasreen and they kissed. After a member of her staff and his young son were taken by the Silurians, Nasreen accompanied the Doctor in the TARDIS deep below the Earth's surface. While Nasreen explored underground with the Doctor, she discovered a subterranean metropolis inhabited by the Silurians, far larger than she or the Doctor had anticipated. (DW: The Hungry Earth)

She joined Amy Pond as an ambassador for humanity in the human-Silurian talks on the fate of the planet. Though they reached an understanding, the talks were halted when it was revealed that Alaya, a Silurian, had been killed by Nasreen's friends, causing a civil war among the Silurians. Tony activated the drill at the urging of his daughter, Ambrose Northover, which would destroy the city of the Silurians. The Doctor sent an energy pulse to destroy the drill, to Nasreen's chagrin. Tony, having been poisoned by Alaya, didn't have time to be decontaminated, so he chose to hibernate with the Silurians. Nasreen chose to stay with him. (DW: Cold Blood)