Posts on topic: technical diving


We love diving, whether it's technical diving to explore deep wrecks or just sport diving to search for seahorses or nudibrancs, we can't get enough. We also like to try different equipment and enjoy sharing what we have experienced and learned. We hope you find our blogs interested and that they help you make the most of your equipment and diving.  If you like our blog posts, please feel free to 'like' them and share them with your friends.


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Truk Lagoon - In Deep Ships

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(Chuuk, Federated States of Micronesia)


Momokawa Maru

Truk Lagoon claims the world’s greatest wreck diving and with over 60 ships plus aircraft, in a protected lagoon, the claim is justified. On this trip we were invited to join Max Gleeson ( and Lesley Hillyer (AquaSea) as they continued to work on Max’s second documentary on the wrecks of Truk Lagoon (more below). Martin, with his huge ‘underwater selfie stick’, also joined our group.

Buddha, on the Oite

We have been to Chuuk before, using different twin tank systems and although a simple back plate and harness was the better option, it still felt cumbersome in narrow doorways and corridors. This time we went side mount, I had my Stealth 2.0 Classic while Karen used a Stealth Rec wing fitted to her Classic harness.

In switching from cold water to warm, with different suits, tanks and side mount rigging, it took a couple of dives to get weight, trim and ‘boat procedures’ down pat. Operating out of the Blue Lagoon Dive Shop – our boat driver, Rhys, went from intrigued observer to expert assistant, helping to don tanks after just a few dives.

Roller, near the San Francisco Maru

Max’s second video will feature lesser known and deeper wrecks of Truk Lagoon. This worked well with our objectives to revisit the Oite and because I needed a better photo of a road roller lying on the sand with the silouette of the San Francisco Maru in the background. I'd taken a photo on the last trip, not thinking about the ship in the background (hence, I didn't get it right).

Cutting a long story short, these are the ships, our dive depths and some of our notes for those whom might contemplate similar (and there’s much more to see).


Wreck Our depth   What to see
Yubae Maru 30m tableware and saki bottles, props sticking up
Patrol Boat 27m limited damage, interesting valves and gauges
Nagano Maru 58m trucks and road roller in the hold
Kiyosumi Maru 27m torpedo holes at bow, a bicycle, coral decorated masts
Fujisan Maru 58m a large tanker with fuelling pipes, signal light on sand
Oite 62m one of only two destroyers in the lagoon
Momokawa Maru 36m bridge telegraph and phono tubes
Shotan Maru 49m vehicles in the hold, bullets, shells, pots and pans
Unnamed lighter 27m (see below)
Amagisan Maru 38m large forward gun, great exploring
San Fransisco Maru  62m tanks, vehicles, road roller, engine room and lots more
Seiko Maru 41m large decorated masts, bathrooms and mess, telegraph
Taiho Maru 44m (see below)
Kensho Maru 27m large engine room in excellent condition
Aikoku Maru 40m manoeuvring helm and telegraph at stern, galley
Soporo Maru 26m had to happen – 3m visibility, but clear inside


Highlights for the trip were the Oite, San Francisco Maru and two wrecks that had not been visited by divers for many years.

Tank on San Francisco Maru

The Oite is (was) a destroyer and the speed boat in the lagoon, with a slender hull and with two large props, after the engines, fuel and munitions there must have been little space for the crew (respectfully, some are still there). With a limited run time it was exploring on a schedule (luckily, we did two dives on her), but we located a gun in the wreckage of the upturned bow that we hadn’t seen before. The stern section, upright, has a large gun and anti-aircraft guns that make for great photos. The San Francisco Maru was great, as always, and I got the photo of the roller.

The first of the two ‘new’ wrecks, was the Taiho Maru. Blown in two but Max and MacKensey (our guide) found her rear half. Rumour says it lost popularity as a dive site many years ago because the leaking aviation fuel burned divers’ exposed skin – fair enough! The water is clear now and this wreck, lying on its port side, has one of the most photogenic props in the lagoon.

Taiho Maru

The second ‘rediscovery’ was an unnamed lighter, a maintenance vessel and water pump. It also has a pretty prop, partly buried, with a huge coral fan nearby. The pump control room near the bow was fascinating, full of gauges, valves, and pipes going in every direction. We found navigation lanterns and much of the compass, including brass gimbals and the large glass dome.

Side mount proved a great choice for exploring. With much of the wooden decks rotted away it was easier to slip between the steel framework than it had been before with twins, or to roll 90 degrees and just swim through narrow doorways. Sometimes it was the camera arms that were more difficult to get through windows, when you don’t really want to touch the wreck – to preserve both it and yourself. Both Stealth rigs are very streamlined, meaning minimal exertion and less air consumption at depth – I’ll use it again next time.

Unnamed Lighter

Back to Max’s videos. The first video (volume 1), includes some history on Operation Hailstone (why the wrecks are there) and features 15 of the more famous and popular ship wrecks in the lagoon, plus a chapter on aircraft. It is a great video and it might also be the best ‘dive trip planning tool’ that you’ll ever see. Max and Lesley have done an amazing job organising, filming and putting the video together. I’m looking forward to volume 2, and Max has already offered a teaser on Vimeo.

Cheers, Dave

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Stealth 2.0 Sidemount Shopping 'Wish List'

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The XDEEP Stealth 2.0 is at the heart of the best sidemount system available and the one that you should own, but what else might you need to be a fully equipped sidemount diver?  This article discusses the Stealth 2.0 options and accessories that I considered, over a period of time, when putting together my rig.  Hopefully it will help you get started a bit quicker!

Stealth 2.0

Stealth 2.0 harness Accessories

The adjustable Central Weight Pocket (CWP) is one feature that puts the Stealth ahead of the rest.  The medium CWP (6kg / 13.2lb) works in most situations but a larger (12kg / 26.5lb) CWP may work better with thick dry suits and aluminium cylinders – when you need extra weight.  A small (3kg / 6.6lb) CWP is also made by XDEEP, but the medium CWP offers flexibility even if it is less than half-filled on tropical dives.  Strange as it may sound, I use a medium weight pocket but move my weights from the bottom to the top of the CWP when changing from light weight to heavy rubber fins – it gives me perfect trim.

weight pockets

Additional weight can be added with dumpable weight pockets or trim pockets. The XDEEP dumpable weight pockets (also used with the Hydros and Zeos) come in two sizes and bolt on to the flat square brackets on the waist band. These pockets can sit between your hips and the cylinders, which can push the cylinders out from the body and reduce streamlining (a little).

So unless a lot of weight is needed the larger CWP or trim pockets may be preferable.

XDEEP trim pockets come in two sizes: 3kg (6.6lb) or 6kg (13.2lb) per pair of pockets. These can be threaded onto the shoulder straps or the waist band.  For single cylinder sidemount, with a steel cylinder, the larger trim pocket is a good solution for a 3kg counterweight.

trim pockets

Each Stealth harness includes four rubber rings on the waist band; two fixed with a tri-glide and two floating (to optimise the trim of aluminium cylinders as they get lighter). These rings are very strong and flexible but swapping to steel D-rings can be easier to feel when wearing gloves. XDEEP also offer an optional butt plate for the Stealth, which makes it even easier to clip on steel cylinders when wearing gloves – but some people just like the butt plate as a place carrying accessories.

Additional D-rings and tri-glides maybe added to the harness to make connection points for accessories. Tri-glides on the shoulder straps with thin bungee loops are a convenient way to hold the main loop bungee (for the top of each cylinder) in position.

Regulators, Hoses and Cylinder Valves.
First stage regulators with LP ports on a swivel turret, and a fifth port on the end, are ideal, such as the Tecline R2 TEC Sidemount Set. The swivel turret allows hoses to be stowed neatly and then rotated to deploy the regulators when needed, while the SPGs remain in position.

The end ports on the first stage allow shorter BCD inflator and dry suit hoses to be used, to minimise clutter. If you want to use your existing regulators, and they don’t have a 90 degree port, you could try a 90 degree hose adapter for the first stage.  For many people, a 25 - 30cm LP hose works best between the end port of the first stage regulator and the Stealth’s BCD inflator, however most SM regulator sets include 20cm hoses, which is just a bit short for the inflator, but is fine for a dry suit.  For particularly large divers, longer BCD and drysuit hoses may be needed.  Some people may find that a longer or shorter BCD corrugated hose and inflator hose suits them better, but for safety the corrugated inflator hose must be long enough to allow for oral inflation.

Left and right sided cylinder valves provide the best access for valve shut-down drills and emergency procedures. Valves used for backmount twinsets with blanking plugs, where the manifold would normally go but obviously not needed here, are a good solution.

Connecting your Cylinders.

bolt snap

Cylinders are attached to the harness with a bolt snap (with a larger ring for hands with gloves or just for easier management) near the base of the cylinder and a bungee around the neck.  Two options for connecting the bolt snap are a webbing tank band or a steel ring clamp.

Bolt snaps are secured by a strong cord threaded through the bolt snap and under the cam band / ring clamp. Rubber retaining bands may be used to hold the hoses neatly on the cylinders but you can also make your own using some of the bungee provided with the Stealth – although I do find that these tend to roll off the top of the cylinder.

Accessories.  What accessories do you need - cutting tools, an SMB for open water, torches, wet notes, a reel, spools and line markers? I will often carry these, depending on the dive, and I always include some double-ended bolt snaps (very handy), a spare regulator necklace and spare bungee. I have a small pouch clipped on to my crotch strap D-ring but I’m really looking forward to the new (and larger) XDEEP pouch.

Note that the Stealth comes with a bracket to mount a primary light canister on the crotch strap.

The Stealth 2.0 Sidemount diver’s shopping “Wish List”:

  • Sidemount system:
    • Stealth 2.0 complete set
    • Central Weight Pocket (CWP) – appropriate size.
    • Butt Plate
  • Additional weight pockets:
    • Trim pockets – which size?
    • Dumpable weight pockets – which size?
  • Additional / optional hardware:
    • D-rings
    • tri-glides
  • Sidemount Regulator Set
    • R2 TEC sidemount regulator set
    • 25-30cm Inflator hose
  • For cylinders:
    • Left and right cylinder valves (with blanking plugs?)
    • Webbing tank bands or Stainless Steel ring clamps?
    • Bolt snaps and cord
    • Hose retaining bands or bungee
  • Accessories:
    • Emergency cutting tool
    • SMB
    • Reel
    • Spools
    • Line markers
    • Bolt snaps
    • an XDEEP pouch for backups and spares

Happy shopping – hope your wishes come true!!


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