Watergate was a small and simple conspiracy to begin with. It came unraveled even with the sitting president doing everything to keep a lid on it.
President Nixon set up The Plumbers group in response to a claim by Kremlin-loyal FBI "informant" Aleksei Kulak (J. Edgar Hoover's shielded-from-CIA FEDORA) that the Kremlin had a complete copy of the Pentagon Papers (it didn't).