pt40fathoms once bubbled...
In contrast when one of us goes to the clear ocean for the first time, the most common report is "H*ll, I was at 180 and looked up, saw the boat and the people jumping in, the only way I knew I was deeper than I should be is because the dive master grabbed me and pointed to my depth gauge". More than one of us "mud" divers have felt out of place for the first dive or two when we hit water so clear, it's like looking through air. We get so used to seeing the light fade as we descend, when we fail to see that queue, that seems so natural to us, we get a little disoriented and have to adapt.
That's why we have several dead divers each year. They come as lake/river divers, descend too deep without realizing how deep it really is. When they look at the instruments they panic (too deep, low on air) and ascend too fast. The end.
In most cases they dive without local DMs.