Probably 50 feet and he just got confused on the units. As others have outlined dive to 50m is not trivial outing.
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He could have went to 160' and hung out for 3 or 4 minutes, moved up to 80' and hung out for 10 minutes, moved up to 30 feet and hung out for another 10 minutes and never entered deco.
I know instructors who shouldn't be doing penetration dives themselves taking brand new students to see Snoopy on the Spiegal Grove in Open Water gear. Anything is possible with instructors these days.
Have you ever discussed it with them?
That phenomenon extends to many other groups as well.Yah,
You know instructors. They know everything, can't be taught anything.
I do as well, I'd be interested in hearing the thoughts on it. Perhaps we should start a separate discussion for the topic?I hope he chimes in. He's on this board.