Lutvann is a lake in the recreational area Østmarka in Oslo, Norway.

Located just outside the capital city, it is a popular site for recreation, including swimming[1] and fishing[2] during summer, with brook trout in the lake.

[7] To solve the problem, the chemical Rhoca-Gil was used to try to remove the leaks, but due to inappropriate techniques used during the utilization, the compound did not correctly polymerize, and instead started polluting the area in and around Lutvann with acrylamide and methylolacrylamide.

At the same time, since the compound did not settle it did not either tighten the cracks in the bedrock, and so the leakages did not stop.

[7] During the entire process lasting about a year the two lakes leaked about two million litres of water through the tunnel.