Cargoes saved by wreckers varied tremendously. Cotton was perhaps the most valuable bulk cargo. A bale of cotton might be worth US$50 or $60 in Charleston, South Carolina, but a bale pulled from a flooded hold would be saturated with water, and weigh as much as half a ton. Unusual cargoes salvaged by wreckers included the fossilized "Hydrarchos" skeleton collected in Alabama by Albert Koch, and a locomotive. In 1827 "Guerrero", a Spanish slave-runner carrying 500 African captives, and the Royal Navy warship HMS "Nimble" ran onto the Florida Reef during a running gun battle. Wreckers went to the aid of both ships. After most of the Africans and the Spanish crewmen had been transferred to wrecker vessels, the Spanish crewmen commandeered two of the ships and sailed to Cuba with most of the Africans. The remaining 120 Africans were taken to Key West, and then to St. Augustine. After Congress passed a special law the next year, 96 surviving Africans were sent to Liberia.