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This massive ship appears off the coast of South America immediately after XCOM successfully raids the Overseer ship and brings the Ethereal Device back to base. The Temple Ship's arrival sends seismic shock waves across the planet. Too large (and likely well armed) for any conventional assault even by XCOM's advanced interceptors, it remains unassailable until the Volunteer activates the Gollop Chamber and makes contact with the Uber Ethereal.
Like the Battleship, the Temple Ship doesn't have an exterior model but its interior comprises an entire level by itself.