Tag Archives: Nitrox

Dive 88 – Night Dive

Date: July 4, 2013       Repetitive Dive: 4 of 4

Time In:  22:24    Time Out:  22:53     Time:   :29

Dive Location: Kaiser Reef,   Oahu, Hawaii

Dive Shop:  N/A

Purpose: Night Dive

Dive Type: Boat    Environ: Ocean / Salt

Conditions:  Light Current        Weight:  14lbs.

Visibility: 50-60′

Air Temp:   73      Bottom Temp:  74.0

Max Depth:  59.0′       Average Depth: 41.5′

Safety / Decompression Stops: 3 Min / 15′

Start PSI: 2,816    End PSI: 1,977      Air/EANx:  32%

Exposure Protection: 5-Mil Full Wetsuit, Hood, Boots, Gloves, 2 Dive Lights

Equipment: Spare Air, iGills


We decided to head towards Waikiki so that we could be able to see the fireworks that were scheduled to be fired at Ala Moana Beach Park tonight on our surface interval.

This was the first time I had seen fireworks from the water and the view was spectacular. We definitely had a lot better view from out here on the water than we would have had from Ala Moana Beach park. I am so glad we chose to do our second night dive over here now.

iGills Snapshot

Dive 87 – Night Dive

Date: July 4, 2013        Repetitive Dive: 3 of 4

Time In:  18:59    Time Out:  19:28      Time:   :29

Location: Corsair Wreck,  Oahu, Hawaii

Dive Shop:  N/A

Purpose: Night Dive

Dive Type: Boat    Environ: Ocean / Salt

Conditions:  Light Current             Weight:  14lbs.

Visibility: 80-90′

Air Temp:   76      Bottom Temp:  72.4

Max Depth:  103′       Average Depth: 74.8′

Safety / Decompression Stops: 3 Min / 15′

Start PSI: 3,297    End PSI: 2,214      Air/EANx:  32%

Exposure Protection: 5-Mil Full Wetsuit, Hood, Boots, Gloves, 2 Dive Lights

Equipment: Spare Air, iGills


This dive was a first for me, I have never dove off of an inflatable RIB before. Doing a bankroll into the water was definitely different from what I am used to. Saw lots of jellies in the water tonight, luckily I was not stung by any of them though. This was only my third night dive on the Corsair and it was much better than last time with the current being much, much lighter. Actually had an enjoyable dive this time.

iGills Snapshot

Product Review – Spare Air Model 300-N (Nitrox)

A few months ago I purchased the Spare Air model 300 to attach to my BCD as a completely redundant alternate air source for my dives. Since I do a lot of Nitrox or Enriched Air diving I chose the 300-N model because it comes Nitrox ready.

The Model 300 is a 3 cubic foot or 85 liter capacity scuba tank that can be pressurized up to 3,000 psi, and will give a diver approximately 57 breaths while at the surface. The deeper you are the more the surrounding water pressure will affect the number of available breaths. With this in mind, I only use my Spare Air on shallow dives of less than about 80 feet.

I purchase my Spare Air as a complete kit, which included the Spare Air unit that has the simple to use on-demand regulator with purge button right on top of it, high-visibility yellow mounting holster, coiled safety leash, attached mouthpiece cover, mounting straps with quick release buckles, pop out pressure indicator, and convenient yoke style Refill Adapter that allows me to attach the Spare Air unit to my scuba tank to fill the Spare Air from.

I opted to include the pressure gauge to my unit to replace the pop out pressure indicator so that I know exactly how much pressure is in the unit at any time, not just when it is full to 3,000 psi.

The aluminum cylinder is manufactured just like any other scuba cylinder and includes the same safety features. It should have a visual inspection every year, and also undergo hydrostatic testing every five years, the same as with your other scuba tanks.

A couple weeks ago a friend of mine was diving up on the North Shore when he had a catastrophic failure of  the o-ring where his first stage attaches to the tank, it completely disintegrated. This caused him to loose 1,000 pounds of air per minute. In this type of catastrophic event, with a full cylinder he would only have 3 minutes of air in his cylinder before it was completely empty. Luckily he also carries the same 3 cf Spare Air with him on his dives. He was able to switch over to his Spare Air and return safely to the surface without incident.

Luckily I have never needed the Spare Air in an emergency situation as of yet, but I have run several emergency simulation tests on it from various depths. Because of its small size and thereby limited air capacity it should only be used in an emergency out of air situation.

It will give you those precious breaths needed to return to the surface, but it does not have enough air capacity to allow you to make a 3 minute safety stop on the way up. This is why I choose to only use mine for shallower dives, which do not require a safety stop. If you were to use it on a deeper dive, you would have to just blow right past the safety stop and take your chances for DCS.

I love the Spare Air system for its simplistic design and functionality. For around $300 it can definitely be a life saver, and I wouldn’t do shallow dives without it ever again.

My Product Rating: 

New Scuba Tanks

Since my current scuba tanks will be due for their annual VIP inspections soon as well as their 5 year hydro inspections, I decided it would be a good time to purchase some new ones.

TanksI added four new 80 cf aluminum tanks to my equipment inventory this week. Two black tanks that I purchased from Island Divers Hawaii’s new Schofield Barracks dive shop, and two bright yellow tanks that I ordered from Scuba.com. All four tanks have Pro Valves on them so that I am able to use wither yoke or DIN regulators, giving me more options for later upgrades if I decide to.

I will be using the new black tanks for regular air, and the new yellow tanks will be dedicated to Nitrox fills. I will be using my old tanks as spares for now until I decide what to do with them.

The tanks from Scuba.com were the most expensive because I had to pay full price, along with the high shipping costs to Hawaii. They cost me $276 for both of them, plus another $195 for shipping.

I was able to get both of the black tanks from Island Divers Hawaii for $239 with my 30% employee discount because I am a DMC with them. Normally they are $215 each plus tax so I saved a mint by getting them from Island Divers Hawaii. They even threw in the first fill on each of them for free.

Advanced Open Water Rating & Nitrox Specialty

I had to take the month of February off while I re-certified as an EMT and DMT so I could not continue my diver training until now.

I have decided to continue my training and certification as a diver by completing the Advanced Open Water certification today

I have also decided to add on several of the PADI Specialty courses to continue my diving education and give me more experience in different types of diving.

To start off my specialty training I chose the Enriched Air Nitrox Diver Specialty certification which I completed today as well.

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