A shipwreck discovered on Lake Erie could prove to be one of greatest environmental disasters for the great lakes. The US Coast Guard is assessing whether the leaking vessel is loaded with oil or some type of solvent. The holding tanks are leaking a substance, leaving a 365 by 18 meter slick on the surface, that was spotted by helicopters. Researchers believe the ship is the Argo, which sank almost 80 years ago. In the last 5 years, 89 Shipwrecks have been identified as posing a threat to American water health. Five of those ships are on the Great Lakes and this one has the possibility of being the most hazardous as it may contain Benzol, a petroleum distillate and Crude Oil.