After the Second World War , the atoll's inhabitants were relocated in , after which the islands and lagoon were the site of 23 nuclear tests by the United States until Three families were resettled on Bikini island in , totaling about residents. But scientists found dangerously high levels of strontium in well water in May , and the residents were carrying abnormally high concentrations of caesium in their bodies. They were evacuated in The atoll is occasionally visited today by divers and a few scientists, and is occupied by a handful of caretakers.