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A free flow, even with a cloud of bubbles, should not cause you to rise up. The more air bubbles rising around you the less water their is to provide buoyancy. In an extreme case, this could cause you to sink instead of rise. The rise was most likely caused by tunnel vision, only thinking about...

Club Med Turquoise in Turks and Caicos. They have their own dive boat ( I was in a room less than 120 steps to the boat) , good diving and most importantly lots and lots for my non diving wife to do while I went diving.

Many computers have terrible interfaces impossible to use without the manual, others are simplicity itself. A terrible example is the Suunto Zoop Novo. Out shop rents these and I have to get out the manual or a demo app on my phone to set it for Nitrox. A great example is the Suunto Eon Core...

Make sure you get a computer that you can read easily. The large, lit color screens like on the Peregrine are much easier to read than smaller monochrome screens. If you have perfect close vision and youthful eyes you can ignore the above.

One good thing about the arctic - it stands up to use and washing well. Mine has around 500 dives and probably 80 machine washes on it and is still going strong.

It’s the dive shop

Club Med Turks and Caicos. Lots for your girlfriend to do while you are diving. My non-diver wife loved it.

The most common way to lock a zoop novo is to dive with it in gauge mode. Spend a bit of time learning the mode switches so you can avoid that. Our shop rental computers are always being set to gauge mode by free divers using them (or by mistake) so I've trained myself to always check they are...

There is no requirement for boat dives in a PADI DM course. Many parts of the world have great shore diving. My DM course was only shore dives at 4 separate sites 3 of which had multiple distinct areas to dive. (plus lots of time in the pool) Mine was significantly longer than 2 weekends though.

I'd recommend the computer vs blind trust in the guide/DM. Most guides I've met are very conservative (Including me, when I guide) but I've had at least one guide over the years not deserving of the trust. With him, I stayed several meters above most of the group, and was still on the edge of...

No air trapping issues with my Dimension.... as far as I know. How can you tell itis trapping air? Hard to look and see.

It may be the camera angle but those fins look huge compared to your body. Perhaps try fins with a smaller blade. Less force against you when you kick. I personally prefer smaller blades on my fins, but can still kick faster than most divers on those rare occasions when needed.

It's not just the brand and algorithm but the conservative setting. I dive a Suunto Eon Core set at the default. One of my favourite buddys dives a Shearwater Peregrine which is set to high conservatism. She always runs out of no-deco time first. Another buddy sets his Suunto Eon Core to a...

I checked that on my calculator - you are completely correct!

Tubbataha was amazing, I saw something new on every dive. Worth whatever you can afford. I was on the Infiniti which was a great boat and crew. Highly recommended.

In a good streamlined position with a good kick that will just slow you down and waste effort. The hands are very inefficient compared to the fins. If it actually speeds you up, you need to work on your kick technique or possibly fin choice. For the same reasons why we don't want our students...

Love my Atomic B2 which includes a ball swivel and a slightly longer, very pliable hose. Much more comfortable than my previous reg, it’s miflex hose was significantly less flexible than the rubber hose on the Atomic

For a better time/score: Get as streamlined as possible - arms straight out in front, hands together. Look at videos of competitive swimmers as they push off the wall for examples. If you have different fins available give them each a test run of 200m or so to see which works best. For me my...

PADI call this "Dive Theory" - I've not done the SSI Science of Diving but I'm sure both cover similar topics. PADI Dive Theory: About the Course Dive Theory will dramatically expand your understanding of dive physics, physiology, equipment, decompression theory and dive planning. SSI science...

Check out Fourth Element Proteus II. I'm 6'2" 195 lbs and the large fits me well. XL Tall should work for your student.