Corium has the consistency of lava and is made up of many things, including nuclear fuel, ... The Elephant’s Foot is a large mass comprised of black corium and has many layers.

Corium, the molten core material generated during severe nuclear reactor accidents, presents complex challenges in terms of its behaviour and the associated heat transfer mechanisms.

In February 2020 scientists recreated corium in a lab by heating a mixture of depleted uranium, zirconium, and various metals in an oxygen-free atmosphere at 2,700°F (1,500°C) for four hours ...