Cyclops-6K™, the newest version of the Cyclops-7® Submersible Sensors, enables fluorescence detection to ocean depths of 6000 meters. Reinforced Titanium housing and a specialized optical head ensure sensor integrity at extreme pressures. The LED excitation source allows for low power consumption and excellent signal stability enabling long-term deployments. The introduction of the Cyclops-6K™ gives researchers a new, affordable tool for deep ocean exploration. The Cyclops-6K™ integrates easily with any third-party platform that supplies power and datalogging.