The Rolex Submariner is one of the most iconic watches ever created. Its bezel makes its instantly recognizable to even the most novice of watch connoisseurs, and 60 years after its introduction, the Submariner remains one of the most popular Rolex models. What’s less well known is the complicated (and tiny) pieces that go into assembling a Submariner.

Watchfinder & Co. had its head watchmaker Tony Williams disassemble and then put back together a Rolex Submariner. The resulting video is fascinating and highlights just how intricate the watches are. Performing maintenance on one of these requires the hands of a surgeon. Who knew they even made screwdrivers that small?

Watch the video below to see the Rolex Submariner get operated on:

h/t Esquire

Justin Tejada is a writer and editor based in New York City. Follow him on Twitter at @just_tejada.