Evidently disheartened by the low annual percentage yield earned by storing their money in a body of water, the natives had ended this practice long before the Spanish invaders arrived. But when the disease-carrying Europeans heard about the legend of the golden man (El Dorado in Spanish), they busted a 16th century nut all over Central America. After years of searching for the source of the legend, the conquistadors finally arrived at Lake Guatavita and learned its history.
Its sexy, sexy history.
The problem was, all the gold that had been thrown overboard over the years was now sitting beneath a shitload of water, and submarines were still a good 300 years from being perfected. So the Spanish graciously admitted defeat and moved forward with their conquering, a phrase which here means "they decided to drain the fucking lake." The first attempt occurred in 1545 when Hernan Perez de Quesada put a chain of slave laborers to work for three months, emptying out the water a bucket at a time.
"While you're at it, try to fill this with gold and/or blood."