Attached to the hull of James Cameron's sub as he descended 11,000m under the sea were three Rolex Deepsea dive watches, which withstood pressures of up to 12 tonnes and surfaced unscathed.

Attached to the hull of James Cameron's sub as he descended 11,000m under the sea were three Rolex Deepsea dive watches, which withstood pressures of up to 12 tonnes and surfaced unscathed.

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