Image courtesy National Science Foundation: https://www.nsf.gov/news/mmg/media/images/oceans_climate2_h.jpg

The entire Global Conveyor Belt looks like the above:

The red lines stand for warmer surface currents, and the blue for the deeper colder currents. 

This conveyor belt regulates the climate for the whole globe.  It is as necessary for life on this planet as the air we breathe.

What happens if it no longer works?

I will talk about this in the following posts.

Want to learn more?

https://oceanservice.noaa.gov/education/tutorial_currents/05conveyor2.html