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The first TBM peaked at 4 meters per week. This increased to 16 meters per week four decades later. By the end of the 19th century, speeds had reached over 30 meters per week. 21st century rock TBMs can excavate over 700 meters per week, while soil tunneling machines can exceed 200 meters per week.
Following a month of maintenance and inspections, Bertha resumed tunneling on Friday, April 29, 2016, [4] and crossed 15 feet (4.6 m) under the closed viaduct in an 11-day closure in early May that ended earlier than scheduled. [61] In June 2016, the tunnel reached its lowest point, 115 feet (35 m) under Madison Street in downtown. [62]
4:11.07 Keith Switzer United States 9 August 2009 50-54 4:15.93 Nicolas Granger United States 4 August 2017 55-59 4:22.49 Michael Mann United States 25 July 2009 60-64 4:34.89 Arnaldo Pérez Puerto Rico 28 October 1958 63 years, 205 days 21 May 2022 65-69 4:37.70 Rick Colella United States 14 December 1951 65 years, 233 days 4 August 2017
13 August 2008: Olympic Games: Beijing, China: 50m butterfly: 23.25 sf: Finlay Knox Canada 11 February 2024: World Championships: Doha, Qatar [9] 100m butterfly: 49.99 CR: Joshua Liendo Canada 3 August 2024: Olympic Games: Paris, France [10] 200m butterfly: 1:52.80 CR: Ilya Kharun Canada 31 July 2024: Olympic Games: Paris, France [11] 200m ...
June 13, 2021 / Omaha, Nebraska same: 200 breast: 2:06.54 [9] Matthew Fallon (University of Pennsylvania) 2024 US Olympic Trials June 19, 2024 / Indianapolis, Indiana same: butterfly: American Record (50 m) U.S. Open Record (50 m) 50 fly: 22.35 Caeleb Dressel (USA) 2019 World Championships July 22, 2019 / Gwangju, South Korea: 22.84
9 August 2003: USA Championships: College Park, United States [22] 400m individual medley: 4:10.02 Ilya Borodin Russia 23 May 2021: European Championships: Budapest, Hungary [23] 400m individual medley: 4:08.94 not ratified, fastest all-time junior: Kosuke Hagino Japan 28 July 2012: Olympic Games: London, United Kingdom: 4 × 100m freestyle ...
Relays: 4×50 m freestyle (short course only), 4 × 100 m freestyle, 4 × 200 m freestyle, 4×50 m freestyle (short course only), 4 × 100 m medley; The relay records displayed here are the official national relay records. However, British Swimming maintains a separate set of national relay records for club teams, which are not shown here.
4.1 m in diameter (13.2 m 2). New York City's main water supply tunnel. Water supply Päijänne Water Tunnel: Southern Finland, Finland 120,000 m (74.565 mi) 1982 16 m 2 cross section. Main water supply tunnel for the Helsinki metropolitan area in southern Finland, drilled through solid rock. Metro Suzhou Rail Transit Line 3-11: Suzhou, China