 "Discovery III", with a passenger capacity of 900, went into service in July 1987.After "Discovery III" took over as the Riverboat Discovery's primary tour vessel, the "Discovery II" went into drydock for repairs and renovation.After approximately 10 years on the drydock, "Discovery II" was relicensed and brought back into service in 1999 in preparation for the Riverboat Discovery's fiftieth anniversary, as well as to handle an increased number of passengers serviced by the company.