The Panerai Submersible QuarantaQuattro Carbotech™ Blu Abisso features a uni-directional rotating bezel to measure submersion time and metallic appliques filled with white Super-LumiNova™ make the watch an indispensable diving instrument. The P.900 caliber features a seconds sub-dial at 9 o’clock and supplies a three-day power reserve.