A group of young people getting ready to scuba dive off the back of a boat in the ocean .
A group of people are about to scuba dive .
A group of young people getting ready to scuba dive off the back of a boat in the ocean.
A group of people are about to scuba dive.
A group of young people is a group of people. Getting ready to do something is being about to do that something. This is a vague restatement.
A group of young people is a group of people . Getting ready to do something is being about to do that something . This is a vague restatement .