Ratio FreeDiver Helium Safe 1000M Stainless Steel Automatic 1066KE20-33VA-GRN Men's WatchThe Ratio Free Diver Helium Safe automatic watch offers an enjoyable and safe feel when you are deep down under water. It is surprisingly accurate and amazingly resilient to shocks and bumps, similar to other dive watches costing more than a few times. Its solid construction ensures a hassle-free dive while the helium valve is an added safety option that will keep your watch safe in case you decide to go for deep-sea diving.