PNNL-Sequim has a hyperbaric laboratory where research is conducted on the physical, chemical, and biological processes occurring in ocean waters as deep as 2 km below the surface. There are six 2-liter Parr reactor vessels available that are rated to 3,000 psi and equipped with custom cooling systems able to chill vessels to about 4°C. These reactors are constructed out of 2205 Duplex and Hastelloy C stainless steel to permit year-long exposure to seawater or concentrated brines. The vessels may be stirred or static. To extract/inject fluids from the Parr reactors while maintaining pressure, there are a pair of Teledyne syringe pumps (rated to 7500 psi). These pumps are used to inject and pull samples of stand-alone view cells equipped with opposing sets of sapphire glass windows that allow users to observe the pressurized fluids.