Drift diving can be very relaxing, being swept along. If you’re drifting with the current you’re going to be using less air, therefore staying longer under the water. With the odd kick of your fins and with a neutral buoyancy you’re being swept along with the current just like the turtle in Nemo “totally cool dude” …. Swimming against the current, means that you will use more air; for example if you have traveled a distance from your boat, or you’ve somehow managed to break away from your group.
“Slowly drifting away
Wave after wave, wave after wave….”
Do you recognise the lyrics?