11. Freeh said he discussed the continuing recovery of wreckage from the ocean bottom . 12. He said foreign automakers resort to costlier measures, such as dredging the ocean bottom . 13. For almost three days, the team charted 2, 000-foot-wide swaths of ocean bottom nonstop. 14. The device scours the ocean bottom searching for metal readings. 15. Veneridae colonize the sandy ocean bottom , and their populations are often dense and large. 16. After nearly two hours of combing the ocean bottom , the researchers hit pay dirt. 17. The video screen shows a virtually unchanging picture of the greenish, sandy ocean bottom . 18. People for years have tried to figure out how to explore the ocean bottom . 19. On the ocean bottom , sand dollars are frequently found together. 20. His loyal crew bury him at the ocean bottom .
