Commercial Diving - FAQ

10/09/2025

Gotta love a sandy bottom!

05/09/2025

Kirby Morgan SL17C

Is dive helmet is fitted with a Divex ultrajewel regulator inlet and exhaust valve. This is arguably the industry standard for Mixed Gas, Closed Bell Saturation Diving.
The Ultrajewel inlet allows an increased flow of gas to the hat at deeper pressures with low resistance and the exhaust valve on the chin captures the gas mix and sends it back to a reclaim system on the ship to be scrubbed, filtered, cleaned and topped up with oxygen before getting sent back down to the divers.

Whats the purpose of the reclaim system?

HeO2 is what Sat divers breath at depth. Helium is an expensive and finite resource that can't be syntheticly produced so the less we waste, the better. It's a valuable gas across a wide range of industries, not just a wasted party trick.

A little formula of averages.

Helium, +/- $0.30c per litre
Per Diver high load breathing rate - 40ltr per min (As per IMCA ref.)
Depth 100m = 11 ata (10ata depth + 1ata surface pressure)

(11 x 40)0.3 =
440 x 0.3 = 132

1 diver will breath about $132 of helium p/min

If 2 Divers have a 6 hour lockout time on a bellrun at 100m without a reclaim system it would cost about $100k including wages for the team.

To all the keyboard warriors, feel free to correct the math 🙃

Dive safe.

10/08/2025

Let's go! Blow down in 5 and rolling out with the OCDbaggie🦀.

These things like tanks and are built to last the abuse I'm about to throw at it!

Get yours at ocdiving.co and use COMDIVE25 at the checkout for a 25% discount.

Cheers to OCD for the hookup! 🤙🏴‍☠️⚓️🔱☠️

08/08/2025

System is on surface. SPHL drill to kick off the campaign. It happens to be the only area on the vessel that not 45 degrees celsius.

19/03/2025

Very accurate and indepth explanation of the job.

Deep under the ocean, saturation divers risk their lives for oil, infrastructure, and exploration. Extreme pressure, isolation, and deadly risks—discover the...

27/02/2021

Free Commercial Diving C.V. template.

I made a video on YouTube a while back about writing an industry specific Diving C.V. and offered two free .doc templates to those who were interested.

If you would like a copy of these, email me at [email protected] and I'll reply with the files.
There are two versions that cover both experienced divers and new entrants into the industry.

I would also recommend checking out the short video I made to get an overview on how it's set out and why.

Link:
https://www.youtube.com/watch?v=IKqBF1_0CY4&t=149s...

alternatively, you can go to my Instagram profile page and follow the link to my YouTube channel.

https://www.instagram.com/commercialdivingfaq/

Good luck to everyone for the job hunt!

22/02/2021

FAQ.

Q) Do dive companies prefer entry level tender/divers from a certain dive school or program?

A) Any school that trains you, will do so under your country's local regulations. Most schools adhere to these regulations when training student's and the result is an internationally recognized certification. Employer's generally see these school certificates as equally weighted.
So, there is no preferred school as such but you need to find out if the certification they provide is locally & internationally recognized.

To find out if your certification is internationally recognized, visit;

IMCA (International Marine Contractors Association)
https://www.imca-int.com/information-notes/diver-diving-supervisor-certification/

or visit the Commercial Diving FAQ YouTube page for more industry info;
https://www.youtube.com/c/CommercialDivingFAQ

18/09/2020

This is a video showing a C.N.S. (acute oxygen poisoning) in a DDC.
Imagine if this happens under water.

Crise hyperoxique lors d'une expérience en caisson

23/06/2020

An interesting watch.

Get 1 year of both Nebula and CuriosityStream for just 19.99 here: http://curiositystream.com/realscience using the code "realscience" New streaming platform...

07/06/2020

FREE diving C.V. template download.
Whether you're new into the Commercial Diving industry or just want to polish up your C.V. with a simplistic but informative look, here's a video to help you with the first step toward getting that next job.

FREE DIVE C.V. TEMPLATE! Find out how to download below. If you're looking to write a C.V for the Commercial Diving industry, this video will give you the ba...

30/05/2020

Here's a video providing some constructive information for people looking to get into a Commercial Diving career. If the dream to work subsea is there, coupled with the right information, you can make an informed and educated decision.

https://www.youtube.com/watch?reload=9&v=TXsj3daIzj8

If you're thinking about making a CAREER change to COMMERCIAL DIVING in your 30's or even 40's then WATCH this. I go through a few topics that you NEED to co...

25/05/2020

The Jascon 4 tug capsized on May 26, 2013 off the coast of Nigeria with only one survivor from 12 people on board. Now, six months on from the accident, incredible footage has emerged showing the moment the ship's cook was rescued from an air bubble on the ship, two days after the ship capsized. From 20 seconds a member of the DCN Diving rescue team exclaims as the sole survivor's hand comes into view, Okene Harrison was visibly shaken, but alive.

The Jascon 4 tug capsized on May 26, 2013 off the coast of Nigeria with only one survivor from 12 people on board. Now, six months on from the accident, incr...