Since Jacques Piccard and Don Walsh were diving down 10898 meters into the trench in 1960, no other human has been down there again. The deep sea is truly less known to mankind than the surface of the moon.
Here come pictures showing the Rolex Deepsea on the robotic arm:
(Source of all photos used in this post)
On the above photo you can see the comparison of James Cameron’s arm versus the size of the Rolex Deepsea Challenge.
Here you see photos from the Rolex pressrelease, showing the Rolex Deepsea Challenge frontal view as well as a side view showing you how high the crystal sits:
This watch is considered an experimental watch, details about this watch can be found below:
A comparison of the two Rolex that went down in the Mariana trench in 1960 and 2012:
About the Mariana Trench:
Last but not least, a comparison of the two submarines that were used for the dive in 1960 and 2012:
James Cameron said that fear is an important part when doing such a mission. It is paramount for a scientist. However, he overcame his fear and accomplished a mission that noone else has done in the past 52 years. Congrats to James Cameron. My respect.