I am creating an earth like planet with similar gravity and size and a new material has been created that can withstand the extreme temperatures and pressures of the earth's core! (Some hand waving on the subject of the material) the people of this planet wish to use it to create a low gravity atmosphere deep beneath the planets surface (hand waving on how they got that deep and on how they built the structure as they went) used to train astronauts, conduct experiments, etc. air circulation is accomplished with pumps and the extreme heat is kept at bay by a cooling system. This would work like a hotel sized elevator to get people in and out.
My question is, would this actually have low gravity and is there any additional hand waving I need to make this possible?