Introduced in 2008, the popular Deepsea took the Sea-Dweller to another level, more than tripling its water resistance to an impressive 12,800 feet / 3,990 meters. This actually is the result of a fair share of engineering marvels, including the 5mm-thick sapphire crystal to bear the underwater pressure assisted by a visible Ringlock system that keeps the watch’s thickness under the range of 18mm. Besides, of course, the replica watches features a Cerachrom bezel, and the new Chromalight lume. In summary, this was the Formula 1 of Rolex divers, in a 44mm case. 
A very unique edition was released in 2014 to commemorate James Cameron’s 2012 expedition into the Mariana Trench. The D-Blue edition was an event in itself, as the fake Rolex almost never acts like this. The replica watch wasn’t strictly limited in number, and remains available to this day, with its gradient blue dial having found some die-hard enthusiasts. And if you feel 44mm might be too big, this has to be compared to the 51mm measurements of the custom Deepsea Challenge that survived a depth of 10,908 meters on the side of James Cameron’s vessel. That’s serious.
With the introduction of this very unique model, the Sea-Dweller returned in 2014 after a five-year absence. Surely, the watch received a bezel upgrade to Cerachrom ceramic instead of the aluminum of the former Sea-Dweller. The case went back to 40mm, with lugs thinner than those of the replica Rolex Submariner. It gave many details that vintage enthusiasts could relate to, from the Maxi dial with oversized indexes to the full minute markings on the bezel, also found on the vintage MilSub. It also features the modern comfort of the Glidelock adjustment on the clasp and the effective blue Chromalight lume.
However, this special model is also the most short-lived Sea-Dweller in history, replaced just a couple of years after its original release. Despite its technical feats, it never managed to justify its price premium over the Submariner, often solely being identified as the “Submariner without cyclops.” However, as soon as the news of its disappearance hit Basel this year, the second-hand value of the great watch suddenly soared. 
Ben reviewed the new model very closely earlier this year, and you probably remember the watch’s most striking novelty: a cyclop over the date. It became the very first Sea-Dweller to feature one, a radical departure from the original model. Yet, its single red line also offers an amazing nod to the first prototype Sea-Dwellers.
Very apparently, these replica watches has grown to 43mm, differentiating it even more from the Submariner, which has stayed at 40mm. However, the lug size also grew to 22mm, which preserved the watch’s proportions in the process.