31. He also worked as director of the Navy's Deep Submergence Systems Project in the late 1960s. 32. Growth is checked when a seedling is completely submerged by flooding, and prolonged submergence kills the seedling. 33. Most tolerant of submergence is cordgrass which has a hollow stem that allows oxygen to reach its roots. 34. The submarine rescue vessel conducted deep submergence tests on a new submarine rescue chamber, RC-21. 35. At San Diego, " White Sands " resumed her research assignment with deep submergence vehicles. 36. "The first submergence was on 15 September, two weeks after the aircraft had been shot down. 37. When this project is constructed, the land submergence would be more than that of Polavaram back waters. 38. Certain types of evidence dependent on organic material, such as radiocarbon dating, may be destroyed by submergence . 39. As noted above, the final sudden submergence of Atlantis due to earthquakes occurred in 9, 564 BC. 40. "Watching the vessel closely, it was seen from time to time that this submergence forward was increasing.
