Students in Basic Underwater Demolition/SEAL participate in rock portage. Students in Basic Underwater Demolition/SEAL Class 282 participate in rock portage in Coronado, Calif., on April 13, 2010. Rock portage is a training cycle designed to challenge individual skills and teamwork as students struggle to get their inflatable boat safely ashore. SHARE IMAGE: Download Image: Full Size (0.08 MB) Photo By: VIRIN: 544441-L-PNC00-020.jpg Photo Gallery