 Today, the Submariner and Submariner Date models are equipped with Rolex Calibres 3130 and 3135, respectively, and feature luminescent hour markers, a unidirectional rotatable bezel with Cerachrom ceramic insert, and a solid-link Oyster bracelet.They are water resistant up to 300 metres (1000ft).The Submariner model went into production in 1953 and was showcased at the Basel Watch Fair in 1954.