Water pressure in Earth's oceans increases by one bar for every 10 m of depth. How deep would you have to go to experience pressure equal to the atmospheric surface pressure on Venus?

920 metres.

Explanation:

As one goes down under water, one additional atmosphere of pressure will be added for each metre descended. This is because water is much denser than our atmosphere.

Due to the incredibly high density of the Venusian atmosphere, the surface pressure is much higher than that of Earth's atmosphere. The atmospheres themselves are quite different, with that of Venus being made up mostly of carbon dioxide instead of the nitrogen of Earth's gaseous layer.

It is the pressure, however, that really sets these two worlds apart. Surface pressure on Venus is over 90 times sea-level pressure on Earth and even probes require submarine-like designs.