This diver is an experienced diver who knows he has a higher than normal air consumption rate. He is aware this may be inconvenient for other divers in the group who have the air supply to dive longer, but must cut their dive short when diving with him. His instructor advised the diver that if he could dive with a steel tank he could carry more air for his dives, but it would reduce the amount of weight needed to stay negatively buoyant. The instructor explained the larger steel tank was negatively buoyant and therefore has a tendency to flip an unaware diver upside down. The diver was instructed on how to handle the steel tank underwater and was advised to remove 2kg (approximately 4lbs) from his 5kg (approximately 11lbs) weight belt.