HALL OF MJOLLNIR
The Hall of Mjollnir is the name given to the passageway within the labyrinth deep underground on Cimmeria. As a means of protecting the planet, a monolith near the stargate uses a scanning beam to identify the Goa'uld, known as Etins, and sends them to the labyrinth. There a holographic projection of Thor explains that the labyrinth leads to Thor's Hammer, a device from which only the host can leave alive.
Episode Reference: Thor's Hammer