Spies in deep cover are also known as moles, which is a term used to describe undercover agents who infiltrate organizations or groups in order to gain information. These agents are usually placed in positions of trust and remain undetected for long periods of time, often years. They are tasked with gathering intelligence and reporting back to their superiors. The goal of a mole is to remain undetected and to provide valuable information that can be used to further the interests of their organization.