Logbook Scuba Dive # 322 - Heian Maru
| Logbook Scuba Dive # 322 - Heian Maru |
Good| Cylinder Set #1 | |||
| Cylinder Type: | Cylinder Size: | Working Pressure: | Supply Type: |
| Alumimium |  20 litres |
200 bar |  Open Circuit (OC) |
| O2: | He: | Min. PPO2: | Max. PPO2: |
| 21% | 0% | - | 1.4 bar |
 EAN 21 |
MOD: | EAD: | END: |
| 56.6 m | 56.6 m | 56.6 m | |
| Start Pressure: | End Pressure: | Diff. Pressure: | |
| 209 bar | 94 bar | 115 bar | |
| Avg. Depth: | SAC Rate: | ||
| - | - | ||
| Cylinder Set #2 | |||
| Cylinder Type: | Cylinder Size: | Working Pressure: | Supply Type: |
| Alumimium |  5 litres |
200 bar | Open Circuit (OC) |
| O2: | He: | Min. PPO2: | Max. PPO2: |
| 61% | 0% | 0.19 bar | 1.6 bar |
| EAN 61 |
MOD: | EAD: | END: |
| 16.2 m | 3.0 m | 16.2 m | |
| Start Pressure: | End Pressure: | Diff. Pressure: | |
| 200 bar | 150 bar | 50 bar | |
| Avg. Depth: | SAC Rate: | ||
| - | - | ||
| Avg. Depth: | SAC Rate: | ||
| 15.61 m | 14.04 litres/min | ||
| Gas Mixture: | |||
| Air (O2=21%) Nitrox 61% - Stage 1 (O2=61%) | |||
| HEIAN MARU At 2 p.m. we headed back to the Blue Lagoon Dive Shop. A 5 litre aluminium stage cylinder with EAN60 had been requested for me, so I analysed it (EAN61) and attached my stage regulators. With everyone aboard the dive boat, we headed out for the dive site of the Heian Maru, the largest wreck in Truk Lagoon, this time with 3 snorkelers aboard as well. The Heian Maru was a large combined passenger-cargo liner which was converted to a submarine depot ship before the war. Tonnage: 11,616. Length: 155.4 metres. Beam: 20.1 metres. Launched: 16 April 1930. She was sunk on the second day of Operation Hailstorm by a torpedo and came to rest on her port side in 34 metres, with just 14 metres to her starboard beam. Tryvin gave us another excellent dive briefing and we again geared up. I'd adjusted my weight harness down to 2 kg of lead. While gearing up I realised I hadn't put the harness on. I thought about it and decided zero lead weighting should be fine. Turned out I was right. Hold two of the Heian Maru contained a large number of submarine torpedoes. They are 21 inches (54 cm) in diameter and quite long. Much larger than I'd expected them to be. On some the twin propellers can be seen at the tail end. For me the highlight of diving the Heian Maru was coming across four tubular shaped objects as we headed aft into a passageway on the promenade deck. They are approximately 6 to 10 metres long and about 25 centimetres in diameter. On one end some of them have folding handles, while the other end tapers to an asparagus-shaped head. These are spare periscopes for submarines. As we headed further aft in the passageway we came across more of them. Periscopes are sensitive instruments with delicate optical systems. Thus they were kept out of the general cargo area and stored in the glassed in passageway for protection. The two large ships propellers at the stern of the ship are certainly eye catching. As we ascended I switched to the EAN61 on the stage cylinder at 14 metres and breathed it down to 50 bar by the end of the dive. Thus we completed a decompression dive with a maximum depth of 27 metres and 64 minutes in duration. |
|||
|
|
| Field1 | |||
| - | |||
| Field2 | |||
| - | |||
| Field3 | |||
| - | |||
| Field4 | |||
| - | |||
| Field5 | |||
| - | |||
| Field6 | |||
| - | |||
| Field7 | |||
| - | |||
| Field8 | |||
| - | |||
| Field9 | |||
| - | |||
| Field10 | |||
| - |