On February 23, 1942, a Japanese submarine attacked the Ellwood oil field to the west of Isla Vista, and in response the United States Marine Corps took over the land immediately to the east of Isla Vista (now the UCSB campus) and the land that now forms the Santa Barbara Airport. The Marine Corps developed Marine Corps Air Station Santa Barbara as an important flight training facility for squadrons fighting the Japanese in the Western Pacific, most notably the famed Blacksheep of VMF-214 trained here until their ill-fated deployment aboard the USS "Franklin" (CV-13). In the process of this crucial war-time development of the air base, Mescalitan Island, home of a tribal king and site of extensive sacred Chumash cemeteries, was bulldozed to fill most remaining portions of the Goleta Slough, once an extensive estuary that sustained a few thousand Chumash. The slough was at one time deep enough that Spanish explorers were able to sail near to the foothills, past the location of present-day Hollister Avenue. By this time, however, most of the slough had been silted in by the enormous deluge of 1861-62, as well as by dirt loosened from agricultural operations in the area. The Marine Corps filled in the remaining deep channels, particularly one that is now under the primary runway used for civil aviation today. The Marine Corps then built a sewage processing facility on the bulldozed sacred Chumash cemetery. Today this is the site of the Goleta Sanitary District facility.