CORONADO, Calif., (Apr. 13, 2018) The fourth week of training is known as Hell Week. In this grueling five-and-a-half day stretch, each candidate sleeps only about four total hours but runs more than 200 miles and does physical training for more than 20 hours per day. Successful completion of Hell Week truly defines those candidates who have the commitment and dedication required of a SEAL. Hell Week is the ultimate test of a persons will and the class' teamwork. U.S. Navy SEAL candidates participate in Basic Underwater Demolition/SEAL (BUD/S) training. SEALs are the maritime component of U.S. Special Forces and are trained to conduct a variety of operations from the sea, air and land.(U.S. Navy photo by Petty Officer 1st Class Abe McNatt)