Tarmac Group mixed concrete, asphalt and contracting businesses in the United Kingdom. Projects undertaken by or involving Tarmac Construction prior to demerger of that business in 1999 included the Preston Bypass completed in 1958, the St Albans Bypass completed in 1960, the Ahmed Hamdi Tunnel in Egypt completed in 1981, the Thames Barrier, the Joint European Torus and Drax Power Station all completed in 1984, the Merry Hill Shopping Centre completed in 1985, the Albert Dock refurbishment completed in 1988, the Conwy Road Tunnel completed in 1991, the Channel Tunnel completed in 1994, the Medway Road Tunnel completed in 1996, the Swindon
Cetacean surfacing behaviour Cetacean surfacing behaviour Cetacean surfacing behaviour or breaching is a group of behaviours demonstrated by the Cetacea infraorder when they come to the water's surface to breathe. Time intervals between surfacing can vary depending on the species, surfacing style or the purpose of the dive, and some species have been known to dive for up to 85 minutes at a time when hunting. In addition to respiration, cetaceans have developed and used surface behaviours for many other functions such as display, feeding and communication. All regularly observed members of the order Cetacea, including whales, dolphins and porpoises, show a range