This is a question few people ask for the simple fact that it is unlikely that someone will go down 40 meters underwater, for obvious reasons. But in any case it is important and interesting to know how far the new Apple device can withstand the pressure.
If we stick directly to the answer to this question, is that if you hold the immersion without problems at that depth and for 4 weeks. How can you see in the header video these tests have been carried out in a container that simulates this situation and verifies something that we are not really going to test, but that helps to convince us that the watch withstands water well and gives us a little of tranquility.
As for me and despite all this type of evidence that we have seen in videos and others, I can tell you that I keep leaving the watch away from the water except when I go out to play sports and I end up sweating, it is at the time of get home when I spray it under the tap. Obviously it is something very personal and everyone can do with the Apple Watch what they want and thanks to tests like this they can give us a little more confidence with liquids and the watch.