Recently on the PADI Pro’s LinkedIn Group, instructors discussed underwater activities for teaching the Deep Diver Specialty and also the Advanced Open Water deep adventure dive.
Pasted below are the top five suggestions from the group. Some are strictly color change at depth (AOW adventure dive) while others include ideas for showing pressure change at depth (Deep Specialty).
Take three neoprene can coozies of different colors strung on a short length of rope. Tie a small lead weight to one end.
- Using different colored coozies allows you to show color change at depth. Use your dive light to reveal the coozies “real” color.
- The neoprene shows how a diver’s wetsuit compresses at depth and loses some of its thermal properties
- It also shows how compression affects buoyancy – at the surface the cozies stayed afloat, but at depth the weight is more than enough to sink them. This demonstrates how a wetsuit loses buoyancy and the diver’s need to adjust for pressure differences.
- Bring down two identical plastic bottles:* one filled with water and one filled with air.
- At depth, show students the difference the crushed “air” bottle.
- Next, open the cap allowing the crushed bottle to take on its normal shape. Water will fill the bottle to a level dependent on your depth.
- Bring the bottle up to the surface and use it during the dive debriefing.
- Hold the pressurized bottle inverted and slowly open the cap to allow the water to spray out and the air expand out to cap at atmospheric pressure.
* The instructor who posted this suggestion recommends using a soda bottle which will come back to shape better than a thinner water bottle not designed for pressure.
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- Shows color changes at depth
- Works as a mental challenge (and a dexterity challenge if students are diving with gloves)
- To make it more difficult, write black numbers above each hole and challenge students to solve the puzzle in sequence
Demonstrate the effects of pressure at depth with this floating egg yolk magic trick.
- Descend to 90 – 100 feet and gather divers around you in a circle.
- Show the students the egg magician-like. Look, it’s just a normal egg.
- Carefully crack the egg open with your dive knife or other implement.
- The yolk will stay in the shape of a small ball.
- If divers are close together you can play ping-pong with the yolk (be gentle).
Important considerations for the egg magic trick:
- This trick works best at 85+ ft but please let safety dictate your depth.
- If you can get a double-yoke egg it’s extra-trippy (ask at your local farmer’s market) .
- Do not attempt this trick in an area where fish-feeding is prohibited.
- Vegan divers probably won’t like this trick.
If you have any deep dive activity ideas you’d like to share, please leave them as a comment below.