RedactedNarrative: Vessel 1 operating < 5mph with two persons on board, traveling S/E in Mill Neck Creek did run aground in the shallow/ marsh area causing no damage to vessel. Operator and passenger voluntarily left vessel and attempted to walk ashore, but were unable to traverse through the mud at low tide. Nassau county police responded and conducted a hoist operation to remove passenger to Center Island Beach where Bayville Fire Department transported passenger to Nassau University Medical Center.