Because titanium alloys have high tensile strength to density ratio, high corrosion resistance, fatigue resistance, high crack resistance and ability to withstand moderately high temperatures without creeping, they are used in aircraft, armour plating, naval ships, spacecraft, and missiles.
For these applications, titanium is alloyed with aluminium, zirconium, nickel, vanadium and other elements to manufacture a variety of components including critical structural parts, fire walls, landing gear, exhaust ducts (helicopters), and hydraulic systems.
In fact, about two thirds of all titanium metal produced is used in aircraft engines and frames. The titanium 6AL-4V alloy accounts for almost 50% of all alloys used in aircraft applications.
As can be seen from above, titanium, whilst not as strong as stainless steel, given its density and weight it makes for a very practical material to use within the dive industry.