Ciekawostka: A mole can dig a tunnel 300 feet (91 m) long in just one night

Evidence: 35 • authority: 90

The effects of soil compactness on the burrowing performance of sympatric eastern and hairy‐tailed moles. Abstract Burrowing is an energetically costly form of locomotion that has evolved multiple times in mammals. Burrowing performance is associated with varying degrees of morphological specialization and is also affected by the characteristics of the substrate that animals burrow in. Moles (Talpidae) are well known for their specialized forelimbs and extreme dedication to life underground. In this study, we investigated how soil compactness affects burrowing performance in two sympatric mole species, eastern moles (Scalopus aquaticus) and hairy‐tailed moles (Parascalops breweri). We measu…

Evidence: 35 • authority: 72

The Transbay Tube is an underwater rail tunnel that carries Bay Area Rapid Transit's four transbay lines under San Francisco Bay between the cities of San Francisco and Oakland in California. The tube is 3.6 miles (5.8 km) long, and attaches to twin bored tunnels. The section of rail between the nearest stations (one of which is underground) totals 6 miles (10 km) in length. The tube has a maximum depth of 135 feet (41 m) below sea level. Built using the immersed tube technique, the Transbay Tube was constructed on land in 57 sections, transported to the site, and then submerged and fastened to the bottom – primarily by packing its sides with sand and gravel. Opened in 1974, the tunnel was…

Evidence: — • authority: 35