The Doctor and Alice are taken to the base's bridge where they are questioned about why they are there and how did they get there.
The chief Silurian asks the Doctor:
"You are Galifrex"
The Doctor replies that his race were known as Gallifex "in the old time"
He then goes on to explain that he and Alice are here to stop whatever is happening.
The Silurian explains that they were woken by the fighting above. They are sick of having "their world, infested" and are taking step to stop it.
To this end they have created a device that will create a tsunami to destroy not just a large part of Australia but also a considerable part of SE Asia.
Alice protests but the Doctor silences her.
The doctor states that he wants to see an end to the terror and offers his services as an interlocutor...
Meanwhile a Australian Navy ship is scanning the area where the unusual activity is coming from. They are under orders from Canberra to destroy the threat. Depth charges are primed and readied.
The Doctor is still trying to explain his mission. When the Silurian asks why he should be concerned about a miserable race of humans.He replies.
"I am here to right a wrong, a wrong yet to be made. Yes the humans are a bloodthirsty race but I know that there will come a time when this world will be at peace. By destroying their world you will be as bad as they are."
As the Silurian considers his offer an alarm rings out across the base. They are under attack. The Australian depth charges have found their base...
A pitched battle takes place between Australian navy soldiers and a team of Silurian commandos.
As the battle rages the Doctor pleads with the Silurian to help stop the battle. He is taken to a monitor which flickers into life. The Doctor demands that the navy stops the attack saying there is a human on board and and that the attack must stop. The Navy realising that Alice is on board the base stops the attack. The Silurians also stop...
On the coast that night The Doctor, Alice the Silurians and the navy as well as representatives of the Australian government meet
The Doctor states that the Silurians will re-enter their hibernation phase and stop further attacks. In return the Australians will stop all activities in their area.
The agreement made the Government representative asks if the Silurians will help them in the war. The Silurians refuse.
As the parties disperse the Doctor is set to leave when Alice stops him. The Doctor replies
"Alice I have travelled time and space, I have seen wonder and horror. I have seen friends, enemies, kinsmen die. I am not the man I was. I don't think I could be again"
Alice says:
"Kindness in words creates confidence. Kindness in thinking creates profoundness. Kindness in giving creates love.
Lao Tzu"
The Doctor is astounded. Alice grins and say she studied philosophy before becoming a nurse.
"Doctor. You are a good man. I can see that but you shouldn't keep it enclosed in your heart...hearts. I have nothing here. My family are dead, my job is gone. I can help you refine whatever that was lost"
The Doctor says "What your'e letting yourself in for won't be easy"
"After this, I'm ready for anything."
The Doctor and Alice enter the TARDIS and dematerialise...