thought to be about 300 million submerged trees worth as much as $50 billion", making underwater logging as a whole an industry with the potential for high profits. Logging methods Remote controlled vehicle One method of unearthing these sunken trees is by sending a remote controlled vehicle, like a sawfish harvester, underwater to fell the trees, keeping the operator of the vehicle dry. This vehicle is controlled by a cable that sends electricity and control inputs to the vessel which sends back a video feed for the operator. The operator sends inputs from a control panel on a barge. When a tree is found the Sawfish attaches and inflates a flotation device to it so that after the tree is cut it immediately rises to the surface for extraction from the water. Attaching buoys Attaching buoys is one of the main processes by which underwater logs are salvaged from the bottom of lakes and rivers. First, a scuba-diver must locate the sunken logs in the water, searching from about three feet from the bottom of the lake or river. After that, a buoy is placed around the log about three feet from its back. From there, a boat uses a gaff hook to catch the buoys and pulls the log close enough to the boat where the crew is able to tie the logs close to the side of the boat. This process repeats itself until the boat is filled to its capacity, after which the expedition is completed and crew must return to base before harvesting any additional logs. Floating logs In the case of floating logs that have not been drowned but may have been separated from initial logging routes and stuck on the banks of rivers and lakes, a new process is utilized. Here, truck inner tubes are completely deflated so that a diver can slip them over the logs. After this occurs and once the tubes are securely in place, a hookah compressor and a low pressure hose re-inflates them so that they form a tight grip around the floating logs. This process gives the logs more buoyancy and gives loggers easier access points to harvest them. As many tubes that are needed are used to float the logs. Environmental impacts Marine pollution Ships are polluting both in the marine environment and in the atmosphere, and although it is difficult to estimate the magnitude of the