The Golden Gate Bridge in San Francisco, California is an engineering marvel. It spans 3.7 miles.

But how deep is the water under this iconic bridge?

It turns out the water under the Golden Gate Bridge is up to 372 feet deep. It's 300 feet deep on average.

The depth varies based on tidal and weather conditions.

That massive water depth makes it one of the deepest-water bridges in the USA.

Swipe up to read more about this modern marvel.