Silurians waging unprovoked war?

Tags: Fifth Doctor, Silurians, Tegan Jovanka

Warriors of the Deep, episode 4
13 January 1984

2084 and two power blocs are still poised on the brink of nuclear war. Deep below the waves, an undersea defence station spots an unidentified probe, but it's not from their human opponents. Two ancient races have awoken to stake their claim to the planet Earth, and they want rid of the ape primitives called man...