i think 5.70mm is for the movement only as the sapphire is already 3.6mm thick .
Jaeger-LeCoultre engineers have optimised the case to resist the extreme pressures exerted well below sea level by varying the thickness of the case middle, the back and the crystal. The thickest point of the middle now measures more than 5 mm – almost double that of a watch that is water resistant to 100 metres. The back is screwed in to ensure regular and more reliable compression of the joint under strong pressure. The sturdy cambered 3.60 mm-thick sapphire crystal will need to hold its own at the incredible depth of 1000 metres, corresponding to a pressure of 890 kilograms – the weight of a small car!
Jaeger-LeCoultre engineers have optimised the case to resist the extreme pressures exerted well below sea level by varying the thickness of the case middle, the back and the crystal. The thickest point of the middle now measures more than 5 mm – almost double that of a watch that is water resistant to 100 metres. The back is screwed in to ensure regular and more reliable compression of the joint under strong pressure. The sturdy cambered 3.60 mm-thick sapphire crystal will need to hold its own at the incredible depth of 1000 metres, corresponding to a pressure of 890 kilograms – the weight of a small car!
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