RedactedNarrative: On 05-02-2020 at approximately 1417 hours, Vessel 1, a 19 foot Miller Jet boat, Operated by Operator 1 who was identifed by his Driver''s License, was being towed by vessel 2, A 21 foot Baja, operated by Operator 2, who was verbally identifed. The rear portion of Vessel 1 began to swamp while in tow. Vessel 1 then sank completely. once all occupants of Vessel 1 were on board of my patrol boat, one of the occupants suffered from an unknown medical issue. A female subject was then transported to Lake Havasu City Regional Medical Center for further treatment and evaluation. Vessel 1 was recovered by Tow Boat U.S.