BP stock prices again fell. By January 2007, the explosion, coupled with a pipeline spill in Alaska and production delays in the Gulf of Mexico, left BP's stock down 4.5% from its position prior to the Texas City explosion. However, by April 2007, stocks had rebounded 13% erasing the 8.3% loss from 2006. Declining oil prices and concerns over oil sustainability also caused shares to fall in value in late 2008. The Deepwater Horizon oil spill in April 2010 initiated a sharp decline in share prices, and BP's shares lost roughly 50% of their value in 50 days. BP's shares reached
Volume and extent of the Deepwater Horizon oil spill in August 2010. USF's David Hollander remarked, "Oil's presence on the ocean floor didn't diminish with time; it grew" and he pointed out, "the layer is distributed very widely," radiating far from the wellhead. In 2013, some scientists at the "Gulf of Mexico Oil Spill and Ecosystem Science Conference" said that as much as one-third of the oil may have been mixed with deep ocean sediments and dragged to the bottom of the ocean floor where it remains, risking damage to ecosystems and commercial fisheries. Oil at or near the site of the spill following well closure has suggested to