Every dive is briefed on the boat. These days they will also have a website explaining the dives, the required certifications and maximum depth reached.
"A few meters more" is not dangerous per se unless you go below 24 meters (80 ft), but I agree it would be very bad to do that without the divemaster telling you before and also without him/her being a certified instructor.
"A few meters more" is not dangerous per se unless you go below 24 meters (80 ft), but I agree it would be very bad to do that without the divemaster telling you before and also without him/her being a certified instructor.