The only materials that can handle such pressure without support from air inside are strong metals, and then only when very thick.

It was twice as strong as the Earth's strongest metal!

Or was the alien metal strong enough to - Mike made a strangling noise.

It is made of strong metal and riveted to the tree.

The strongest metal handles are those forged in one piece with the head.

There is also a strong metal working industry today.

The ship builders knew how to make really strong metal.

They're thick doors and heavy, with strong, cool metal handles.

These were made of a new, light, but very strong metal to withstand the pressure of a great depth.

Mithril is now often used in other fictional works, usually as a strong and magical metal.