The other posters have made clear that aborting the dive was a good idea and referenced a dive operation that tried to get a diver in the water that did not want to be in the water. Try to stop problems at the surface before they become underwater problems. A diver uncomfortable at the surface will be worse underwater.
Look for overly talkative behavior, unusually quiet behavior, unfamiliarity with equipment, awkwardness and unease, and listen to complaints and concerns. Abort a dive if a diver is uncomfortable, and if they do not want to abort either be very cautious or choose another buddy and alert the DM.
Before they dive, your buddies should practice assembling gear until they know it. You should rent gear and try it out at the surface and in a pool. Ask the LDS questions about the gear you rent. Test the regs at the shop. Know how to manually inflate your BCD.
You all need to practice. Every dive situation will be different! Open Water that is clear and warm has other challenges. There are currents, coral (I really really don't like divers that have bad buoyancy and crash into coral-practice please, plus the coral can bite back!) Salt water also has very different buoyancy tendancies, and drift diving is different from diving in a location and returning to the boat. Do you also know boat diving procedures, exits (backwards roll and giant stride)? Are you planning night dives? Are you familiar with night diving procedures, primary and backup lights, tank lights/glow sticks. Night diving in clear water can feel the same as low vis diving.
Please practice hovering, dive buddy procedures, sharing air, removing gear, clearing masks, removing masks, removing and replacing regulators, recovering lost regulators, swimming w/o your mask but breathing off the reg, setting up gear, and do it all in the pool!
Low vis is usually not no vis. It means adjusting to how you see things. There will be clearer spots and fuzzier spots. Also, there are thermoclines! It can get colder deeper quickly!
As said before, your friends sounded out of shape. They should be able to do a surface swim of 60 yds. They will have to fin underwater and should not be breathless from exertion. They may need to exercise some, or practice finning in a pool and swimming laps.
good luck, dive safely, and keep up your knowledge and training
Look for overly talkative behavior, unusually quiet behavior, unfamiliarity with equipment, awkwardness and unease, and listen to complaints and concerns. Abort a dive if a diver is uncomfortable, and if they do not want to abort either be very cautious or choose another buddy and alert the DM.
Before they dive, your buddies should practice assembling gear until they know it. You should rent gear and try it out at the surface and in a pool. Ask the LDS questions about the gear you rent. Test the regs at the shop. Know how to manually inflate your BCD.
You all need to practice. Every dive situation will be different! Open Water that is clear and warm has other challenges. There are currents, coral (I really really don't like divers that have bad buoyancy and crash into coral-practice please, plus the coral can bite back!) Salt water also has very different buoyancy tendancies, and drift diving is different from diving in a location and returning to the boat. Do you also know boat diving procedures, exits (backwards roll and giant stride)? Are you planning night dives? Are you familiar with night diving procedures, primary and backup lights, tank lights/glow sticks. Night diving in clear water can feel the same as low vis diving.
Please practice hovering, dive buddy procedures, sharing air, removing gear, clearing masks, removing masks, removing and replacing regulators, recovering lost regulators, swimming w/o your mask but breathing off the reg, setting up gear, and do it all in the pool!
Low vis is usually not no vis. It means adjusting to how you see things. There will be clearer spots and fuzzier spots. Also, there are thermoclines! It can get colder deeper quickly!
As said before, your friends sounded out of shape. They should be able to do a surface swim of 60 yds. They will have to fin underwater and should not be breathless from exertion. They may need to exercise some, or practice finning in a pool and swimming laps.
good luck, dive safely, and keep up your knowledge and training