Originally Posted by
Dubaian 
30m down is only for serious divers.
Not really. PADI will let you do 30m within your first 8 dives ever. It's a normal limit for recreational diving, but in no way is for experts only.
Just because you
can dive that deep doesn't mean it's a good idea if you want to spend a lot of time looking around.
https://www.naui.org/resources/dive-tables-review/
You can spend 22 minutes at 30 meters before worrying about the bends.
It rises to 55 minutes at 18 meters, which is much safer if you become enthralled with the location.
P.S., Don't go on a long flight the day after diving.
Experiencing an atmospheric pressure equivalent to 8000 feet above sea level throws the dive tables way out of whack.