Allison and Carter's engagement hits rough waters when Carter's attempt at romance traps them at the bottom of Lake Archimedes in a leaking sub. Their survival depends on Jo's ability to sort through a series of pranks at GD, Eureka style, and an experiment gone terribly wrong.
original airdate: June 11,2012 rating--1.45 million
song--Eureka Theme song--"Eureka On My Mind" by Bear McCreary
Welcome to Eureka, a seemingly normal small town somewhere in the Pacific Northwest. But you won't find it on any maps outside of the Pentagon. And if you're here you must be a genius. Because everyone else in town is.