Where can you get an air bag to raise 6000 pounds up from the bottom of a lake?

You can obtain an air bag designed for heavy lifting, such as a lift bag or salvage air bag, from specialized underwater salvage equipment suppliers or diving gear retailers. Companies that specialize in marine salvage or underwater construction often carry these products. Additionally, online marketplaces like Amazon or eBay may have suitable options. Be sure to choose a bag rated for at least 6,000 pounds to ensure it can safely raise the weight.