Another diatomaceous earth company, Grefco, operated here from the 1940s till 1998. The remnants of its mine at the northeast end of town were torn down in 2001. In 1909, the Sibyl Marston—at the time, the largest steam schooner built on the West Coast—sank nearby while carrying of lumber. Many of the older Lompoc homes were built with lumber from the shipwreck. The wreckage can still be seen south of Surf Beach. The coastal branch of the Southern Pacific Railroad opened around 1900 and eventually replaced ship transportation. A paved road linked Lompoc to Buellton and the rest of California around 1920. In 1923, the Honda Point disaster, the U.S.'s largest peacetime naval accident, occurred just off the coast; nine U.S. destroyers ran aground, killing 23 people. During the Great Depression, La Purisima Mission was restored by the Civilian Conservation Corps (CCC). During World War II, the coast west of Lompoc was the site of Camp Cooke, a United States Army training camp where large units could practice maneuvers. Lompoc grew slowly until 1958, when the United States Air Force announced that the former Camp Cooke would be a test site for the Thor family of intermediate-range ballistic missiles and the first operational base for the SM-65 Atlas, an intercontinental ballistic missile. The city then began to grow rapidly to provide housing for thousands of civilians and contractors employed at what was soon renamed Vandenberg Air Force Base. It was the first missile base of the United States Air Force. The Space Shuttle program was slated to begin launches in the late 1980s, and the city experienced a boom in restaurant and hotel construction in anticipation of tourists coming to see shuttle launches. However, when the Challenger exploded during take-off from Cape Canaveral in 1986, the West Coast shuttle program was terminated, sending Lompoc into a severe recession. Today, Lompoc is called "The City of Arts and Flowers" and is also becoming known for its wines. In 2010, "Playboy" named Jasper's, a local bar, one of the top 10 dive bars in the country. Lompoc is located at (34.646182, -120.460316). According to the United States Census Bureau, the city has a total area of , 99.34% of it land and 0.66% of it water. Most of the city is in the valley of the Santa Ynez River, at an elevation of about 80–100 feet (25–30 meters); recent expansion has been to the north, on higher ground known as Vandenberg Village, with elevations of 150–300 feet (50–100 meters).