Mike and Georgann Wachter - local shipwreck hunters and authors - will talk about the Lake Erie wrecks they have explored at 6:30 p.m., July 9, at Mentor Public Library's Main Branch, 8215 Mentor Ave. in Mentor.The Wachters have spent the last 40 years investigating sunken ships, specializing in wrecks that have occurred in Lake Erie, according to a news release.