Mu guess is that everyone's ears need equalizing every meter--ear drums are just not as strong as the pressure that water can exert. But some people have eustachian tubes that open really easily, and they have had practice swimming underwater, so they are not conscious of equalizing.
When I am scuba diving, I don't have to consciously equalize, unless I have had some recent congestion.
When freediving, there is less air to equalize with, so I have to start intentionally equalizing at about 4 m, and then get more methodical at about 10 meters.
When I am scuba diving, I don't have to consciously equalize, unless I have had some recent congestion.
When freediving, there is less air to equalize with, so I have to start intentionally equalizing at about 4 m, and then get more methodical at about 10 meters.