In this episode, Chris continues his discussions about Lake Michigan with scientists the University of Wisconsin-Milwaukee's School of Freshwater Sciences. Dr. J. Val Klump and his graduate student, Shelby LaBuhn, explain their ground-breaking attempt, using known techniques from atmospheric science that take advantage of the Doppler effect, to analyze changes in current velocities that can reveal changes in the underwater ecosystems of Lake Michigan. They also discuss numerous other phenomena affecting the lake, including the quagga mussel invasion and the hypoxia that can result in fish kills. Finally, Val talks about his unique experience being the first man to reach the very deepest part of Lake Michigan in a manned submersible.