A film crew was dropped by helicopter on Mount St. Helens on May 23 to document the destruction. However, their compasses spun in circles and they quickly became lost. A second eruption occurred the next day (see below), but the crew survived and were rescued two days after that. The eruption ejected more than of material. A quarter of that volume was fresh lava in the form of ash, pumice and volcanic bombs while the rest was fragmented, older rock. The removal of the north side of the mountain (13% of the cone's volume) reduced Mount St. Helens' height by about and left a crater wide and deep with its north end open in a huge breach.