Safecrackers, also known as yeggs, are criminals who specialize in opening safes and vaults without the proper authorization. They use a variety of tools and techniques to break into these secure containers, often using explosives or specialized tools to gain access. Safecrackers are usually hired by criminals to gain access to valuable items or documents that are locked away. They are also sometimes employed by law enforcement agencies to gain access to evidence or other items that are locked away.