Great Ants

The Great Ants are one of the Earth 's three main native species who reside in the underground and have a technological level on par with that of the humans however, they are still behind the evolution of the Dolphins despite them all being inferior-class species.

They have vast colonies deep under the ground which even stretch into the mantle itself where they have magma ships to travel around this seemingly inhospitable location with other species in the area dying off with increasing proximity to the mantle due to the intense heat and pressure from it.

Goals
Their current goal is similar to the Dolphin's in the sense that they wish to gain dominancy over the Earth itself although, they have different means in which they'll achieve this goal as it's mostly to cause mass earthquakes in order to damage the other two main species to give them an opportunity to invade the surface world with the least possible resistence.