The P42H was immersed by the BREST-IROISE team of IFREMER engineers in a giant hyperbaric tank filled with water
and locked with hydraulic cylinders in order to stand up to the incredible pressure simulating very great depths.

The tank was computer operated from an adjoining room. We decided with the IFREMER engineers to increase the pressure by 10 bars per minute,
i.e. 100 metres/m and to level out at 1000 metres for 10 minutes before decreasing the pressure at the same speed.

The verdict was revealed when the tank was opened: the PATTON P42H was brought up in perfect working condition,
set as before its pressurisation down to the second.

What is most incredible in this trial is the phenomenal force at these depths; at 1000 metres the pressure is 100 kg/cm2,
representing over a tonne in weight pressing on the sapphire glass of our P42.

Through these trials in real-life conditions, we once again validated the design and manufacture of our P42H watches
and bring you the reassurance of wearing one of the most watertight watches in the world.