Before revision: Hypogeum can also refer to any antique building or part of building built below ground such as the series of tunnels under the Colosseum which held slaves (particularly enemy captives) and animals while keeping them ready to fight in the gladiatorial games.
After revision: The term hypogeum can also refer to any antique building or part of building built below ground such as the series of tunnels under the Colosseum which held slaves (particularly enemy captives) and animals while keeping them ready to fight in the gladiatorial games.