On one of these dives, Lambertsen experienced an episode of oxygen toxicity but managed to surface without assistance. The LARU was the first rebreather designed and built in the United States and these dives are the first closed-circuit oxygen dives in U.S. Chris Lambertsen performed about 12 Scuba dives in his Lambertsen Amphibious Respiratory Unit (LARU) prototype in Lake Nokomis. Within years of its development, Lake Nokomis surpassed Bde Maka Ska as the most popular swimming beach on Minneapolis city lakes in 1924 attendance at the Lake Nokomis bathhouse was nearly triple the attendance at the Bde Maka Ska bath house. It was deepened by dredging to produce the current lake. Much of it was actually marshland or slough-a drainage area for the neighborhood. When purchased in 1907 by the Minneapolis Park and Recreation Board, the lake was very shallow, only 5 feet (1.5 m) deep in the deepest spot. The lake has an area of 204 acres (0.83 km 2). Because the lower part of the lake is crossed by Cedar Avenue running north-south, the impression from the ground is that the lake is shaped like an L. Two pathways circle the lake, a 2.7-mile (4.3 km) pedestrian trail and a 2.8-mile (4.5 km) bicycle trail. The lake is oval in shape, with a long axis running southwest to northeast. It is located in the southern part of the city, west of the Mississippi River and south of Lake Hiawatha. Its current name was adopted in 1910 to honor Nokomis, grandmother of Hiawatha. The lake was previously named Lake Amelia in honor of Captain George Gooding's daughter, Amelia, in 1819. Lake Nokomis is one of several lakes in Minneapolis, Minnesota, and part of the city's Chain of Lakes.
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