After alternately boating from both Vessel 1 and Vessel 2 (which was tied off to Vessel 1 when not in use) throughout the day the parties aboard Vessel 1 "floated around for a while" on Vessel 1 then decided to head back to shore.  At that time they discovered that Vessel 2 was no longer tied up to Vessel 1 and was missing (although the tie rope was still tied to Vessel 1).
Sandusky                      