A gateway is an access point to Hollow Earth. There are at least two gateways, one which was used by the Sanctuary Network team and another at the site where Helen Magnus pursued and shot Adam Worth; who was then saved by John Druitt and inhabitants of Praxis jointly.
History[]
Season 3[]
| Episode 3x06 - "Animus": Helen Magnus and Nikola Tesla learn that the word "gateway" is a verbal command that the holographic map responds to. The holomap in response will display a holographic representation of the Earth and all of its major tunnels systems traversing the globe under each of the seven continents. | |
| Episode 3x08 - "For King and Country": to be added | |
| Episode 3x09 - "Vigilante": to be added | |
 The Old City Sanctuary team are teleported to a gateway by John Druitt.  | |
| Episode 3x16 - "Awakening": Helen Magnus barters the holographic map to save Nikola Tesla's life from Afina. When Afina asks for the password, Magnus tells her "gateway". |
Season 4[]
| Episode 4x10 - "Acolyte": Kate Freelander told Will Zimmerman that she road "a giant yurka beetle for twelve hours in search of an active gateway" to reach to surface. |