Robert Fuller is no stranger to adventure.It started when he was a child growing up on Tampa Bay in Florida, traversing the bay in well-used boats he and his brother bought for $5 or $10 from local fishermen.At 17, he joined the Marines. By 19, he was shipped to Vietnam.One adventure there involved a 75 mm shell landing at his feet. It didn’t go off.He also did reconnaissance missions there, a few being not exactly authorized solo missions.For 24 years, he worked as an engineer, and supervised construction of oil pipelines in Nigeria.He was a commercial pilot doing aerial mapping, flying all over the U.S. and into Central America.He also spent some time as a commercial diver, working for two different companies in Florida and doing underwater inspection in Georgia.His latest adventure, though, may be his grandest.Big plansFuller, professor of geosciences and director of the Environmental Leadership Center at North Georgia College & State University, began a trek last Saturday at the tiptop of the Chattahoochee River, hiking along the spring that begins the river system that is vital to Georgia, Florida and Alabama.