Launched in 2026, the Longines HydroConquest L3.788.4.06.6 is a notable addition to Longines' HydroConquest series, which features modern dive watches tailored for both professional aquatic activities and daily wear. This model adopts the updated aesthetic introduced with the HydroConquest GMT in 2024, enhancing the layout and finishing of its dial.

Boasting a 42 mm round case crafted from stainless steel, it showcases a screw-in crown alongside a unidirectional bezel that has a ceramic insert, offering water resistance rated at 30 bar. A scratch-resistant sapphire glass with multiple layers of anti-reflective coating on both sides protects the dial, which sports a striking green lacquered finish. Instead of Arabic numerals, it features applied indexes that represent a refined design approach. The watch utilizes silvered polished hands for time indication and includes a date function. Beneath the surface, the Longines calibre L888 powers the watch, a self-winding mechanical movement operating at 25,200 vibrations per hour. It incorporates a monocrystalline silicon balance spring and delivers an impressive power reserve of around 72 hours, managing central hours, minutes, seconds, and the date. Completing its appeal, the timepiece comes with a stainless steel bracelet that fastens securely with a double security folding clasp designed with a micro-adjustment feature.