Foyle Search and Rescue volunteers were involved in this morning's operation.
Thermal imaging was used this morning to locate a person 'in distress' in Derry.
Details of the incident were outlined by a spokesperson for Foyle Search and Rescue who were involved in the operation.
The charity's spokesperson said at 5.15am the PSNI activated FSR's pager system to reports of a person in distress.
"Our Emergency Response Team along with NIFRS and PSNI attended the scene.
"After a joint search with the Northern Ireland Fire & Rescue Service involving the use of thermal imaging a person was located at 05:50hrs.
"The person was then transferred to hospital by the Northern Ireland Ambulance Service. Appreciation to PSNI, NIFRS Teams, NIAS and CCTV for their assistance."
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