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Check your air and depth gauges more often then on shallower dives. You use your air from your scuba tank much faster at depth and you want to make sure that you don’t exceed your planned depth limit.
Watch yourself and your buddy for any signs of nitrogen narcosis.
Consider buying or renting a dive computer to help you stay within the dive’s limits. Owning a PADI ERDP-ML is also helpful.
You may want to complete the PADI Multilevel Diver Specialty course.
Be aware of your limits. Build your experience gradually and consider these five points before a deep dive: how you feel, your buddy, the environment, proximity of help and any previous dives. A 27 meter/90 foot dive in warm, clear water is not the same as a 27 meter/90 foot dive in cold, murky waters with a current.
Use a dive light to add light and to bring out the true colors absorbed by water at depth.
Consider hanging a spare scuba tank at 5 meters/15 feet to provide extra air during a safety stop or emergency decompression.
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