21. When theo cover more than 100, 000 square feet of ocean bottom as a reef. 22. In shallow waters reflectance from other pigments, detritus, and the ocean bottom may cause inaccuracies. 23. Plans were under way to drag the ocean bottom . 24. However, digging up algal deposits from the ocean bottoms isn't going to be particularly effective. 25. After seeking advice from a fabled African witch-doctor, Hellboy dives to the treacherous ocean bottom . 26. Salvagers have recovered four acuators from the ocean bottom . 27. Sea-bottom coral, sponges and seafans also suffer greatly when trawls scrape across the ocean bottom . 28. In addition, activities that disturb the ocean bottom , such as trawling, may damage spawning habitat. 29. The interplate earthquake began in the ocean bottom just off the rugged coast of Graham Island. 30. Unfortunately for the Beetle, Carapax simply walked along the ocean bottom until he surfaced in Metropolis.
