The 1st Submarine Squadron is the unit of the SDF-Navy tasked with training, operation and deployment of the Siorc-class Diesel-Electric Submarines. The 1st Submarine Squadron is based at the Naval Station Tipa and has six submarines, SDFS F-16 Siorc, SDFS F-17 Scadán, SDFS F-18 Trosc, SDFS F-19 Colgach, SDFS F-20 Tuinnín and SDFS F-21 Colgiasc.

The first submarine, SDFS F-16 Siorc, was commissioned in 2019 under the command of Captain Alaina Tumadóir of the Tribe of Wicklow. She also held command of the 1st Submarine Squadron.

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