After fishing out more than 25,000 pounds of underwater junk from Lake Tahoe, divers are gearing up for another round. On Thursday, environmental nonprofit Clean Up the Lake plans to start a multi-year effort to remove trash from deeper parts of the lake, where divers expect to find bigger and heavier items than in shallower areas. … In addition to collecting underwater garbage, Clean Up the Lake’s divers look for invasive species and send any samples they find to the California Department of Agriculture for further analysis. The team is also beginning to monitor for algae and keeping an eye out for harmful algal blooms.