The Tsumeb Museum is run by the Namibian Scientific Society and features a range of information and exhibits about the town s history. Rare minerals are on display as well. The main attraction of this little museum is Khorab Room which exhibits cannons and other artefacts recovered from Lake Otjikoto. The lake was turned into some kind of an underwater museum in 1915 when retreating German forces dumped their weaponry before signing the Khorab Peace Treaty. About 30 cannons and 4 500 boxes of ammunition were thrown in the lake 24 km west of town. Lake Otjikoto is still a popular diving site due to its underwater artefacts.