Egress is an access point on the Molendinar Burn, the historic Glasgow stream that was largely culverted in the 1870s and now flows underground through the city's East End and centre.

Several such access points are distributed along the buried watercourse, used on occasion for maintenance and safety works.

One well-documented open culvert section sits beside the former Great Eastern Hotel on Duke Street, where the burn briefly surfaces before disappearing again beneath the city.

Urban explorers have used access points like this to travel the tunnel system, documenting the burn's varied construction — stone lining giving way to oval brick, low concrete, steel pipe, and stretches of tall Victorian brickwork — along with manholes and side shafts encountered along the route.