The Rolex DeepSea takes the Sea-Dweller model to an unprecedented level with even more advanced features and capabilities. While the original and 50th Anniversary Sea-Dweller watches come in 40 mm and 43 mm cases, respectively, the DeepSea comes in a larger 44 mm case. The DeepSea also extends the Sea-Dweller’s waterproof abilities: it is water-resistant to an astounding depth of 3,900 metres (12,800 feet), compared to the Sea-Dweller’s level of 1,220 metres (4,000 feet). There have also been historical events over the years that have put the DeepSea’s features to the test and solidified its status as a pioneering diving watch that reliably delivers.