Describir: General excavation methods

  _____     _____    _    _     ______    _____    _    _     _  _     ______  
 / ____||  |  ___|| | \  / ||  /_   _//  /  ___|| | || | ||  | \| ||  /_   _// 
/ //---`'  | ||__   |  \/  ||   -| ||-  | // __   | || | ||  |  ' ||   -| ||-  
\ \\___    | ||__   | .  . ||   _| ||_  | \\_\ || | \\_/ ||  | .  ||   _| ||_  
 \_____||  |_____|| |_|\/|_||  /_____//  \____//   \____//   |_|\_||  /_____// 
  `----`   `-----`  `-`  `-`   `-----`    `---`     `---`    `-` -`   `-----`