Indonesia Indonesian Navy, Tentara Nasional Indonesia-Angkatan Laut (TNI-AL)

[Umigami]

Kapal Selam KRI Nanggala-402 Hilang Kontak Saat Komandan Berikan Otoritas Penembakan Torpedo Halaman all - Kompas.com

Kapal Selam KRI Nanggala-402 hilang kontak di utara perairan Bali, Rabu (21/4/2021). Halaman all

regional.kompas.com

"Penenggelaman peluncur torpedo nomor 8 yang merupakan komunikasi terakhir dengan KRI Naggala pada pukul 04.25," ujar Riad saat konferensi pers, Kamis (22/4/2021).

"Pada saat komandan gugus tugas latihan memberikan otoritas penembakan torpedo, di situlah komunikasi Naggala terputus," kata Riad.

Last communication from 402 is flooding of torpedo tube number 8 (launch preparation?)

When the launch command was given, no confirmation back from them was given.

 

[BBOn]

View attachment 18794
View attachment 18795
Source: Lembaga Keris

Why they issued the crew list????
Submariner identities is very classified. It is not for public information.
We have bad management information. We cannot leak everything for public consumption for God sake..

 

[schuimpjes]

Why they issued the crew list????
Submariner identities is very classified. It is not for public information.
We have bad management information. We cannot leak everything for public consumption for God sake..

Are you a police or what? People will going to the jail because of upload that names? Huhh?. That names were already everywhere and no one ranting about it like you.

Stop being naive. If you wanna be a vigilante, I will become more vigilante than you.

 

[Captain Wales]

UK and US? Hmm I am thinking about their Scorpio ROV. They sent this ROV to rescue stranded Russian mini sub before.


Or LR5 like what you said @Captain Wales

The french System were joint operated with the british and norway and base in scotland.
just like the australian LR5, British/french/norway NSRV can be air transport within 48 hours, we just need to provide them with vessel large enough to carry the dsrv.

Australian also operate ex-british scorpio ROV (the one that use on russian sub) when they buy the LR5 from the UK.

The same equipment probably on the SG swift rescue, considering they buying/using the same equipment that the UK operate.

The brits probably have the most experience in sub rescue considering their involvement in the kursk and priz it would be good to have their expertise in this incident.

 

[Umigami]

 

[trishna_amrta]

This make worrisome since survace vessel with hull mounted sonar over searching area didnt yet manage to locate 402.

Of course the can't. They are in different thermal layer. What needed is dipping sonar to go down to the same layer of the sub

 

[Umigami]

Of course the can't. They are in different thermal layer. What needed is dipping sonar to go down to the same layer of the sub

something that our KRI don't have

 

[Captain Wales]

Of course the can't. They are in different thermal layer. What needed is dipping sonar to go down to the same layer of the sub

do towed sonar sufficient for this kind of operation? or using other submarine active sonar to detect it?

 

[NEKO]

The french System were joint operated with the british and norway and base in scotland.
just like the australian LR5, British/french/norway NSRV can be air transport within 48 hours, we just need to provide them with vessel large enough to carry the dsrv.

Australian also operate ex-british scorpio ROV (the one that use on russian sub) when they buy the LR5 from the UK.

The same equipment probably on the SG swift rescue, considering they buying/using the same equipment that the UK operate.

The brits probably have the most experience in sub rescue considering their involvement in the kursk and priz it would be good to have their expertise in this incident.

MV swift rescue have rov and rescue vessels, about experience then yes UK will have lots of it, while it will be the first time for SG.

Submarine can use its sonar for search submarine also have good ears and TNI AL already dispatch other submarine for search, rigel can use its equipments onboard to map and search the seabed.

 

[Anmdt]

MV swift rescue have rov and rescue vessels, about experience then yes UK will have lots of it, while it will be the first time for SG.

Submarine can use its sonar for search submarine also have good ears and TNI AL already dispatch other submarine for search, rigel can use its equipments onboard to map and search the seabed.

At this situation we are probably looking for a submarine has run aground on the bottom. Hydrographic vessels suits best for this case. Anything with a side-scan sonar or multi-beam (such as KRI rigel) sonar for mapping the ocean bottom is needed.
It was a common practice for a vessel with side-scan sonar to acompany torpedo exercises 1st to scan sunken object and to track torpedo.
Moreover, some sources tell the submarine did a successful torpedo fire, some others only indicate it was intended to do. Any other news if it has gone missing before or after firing torpedo?

 

[Anmdt]

do towed sonar sufficient for this kind of operation? or using other submarine active sonar to detect it?

They don't need to use active sonars, the crew will be tapping the hull, or hammer it to signal their location an active sonar may suppress their signals. All needed is a hydrographic vessels to find the site or hydrophones to hear and triangulate their location.

 

[Van Kravchenko]

They don't need to use active sonars, the crew will be tapping the hull, or hammer it to signal their location an active sonar may suppress their signals. All needed is a hydrographic vessels to find the site or hydrophones to hear and triangulate their location.

Seems logic, but survace vessel currently in Indonesia Navy service that can do that only Rigel & Spica.

Also as @trishna_amrta said before, 402 at a different layer: probably both Rigel & Spica hardly struggle to locate 402, especially thorugh sounding.

Now, i dint find any matches conclusion, in one hand REM has detected 2,5 kn movement; in other hand we didnt know where the exact location.

I mean, when you know its movement speed you must be know the exact location of that movement.

 

[Anmdt]

Seems logic, but survace vessel currently in Indonesia Navy service that can do that only Rigel & Spica.

Also as @trishna_amrta said before, 402 at a different layer: probably both Rigel & Spica hardly struggle to locate 402, especially thorugh sounding.

Now, i dint find any matches conclusion, in one hand REM has detected 2,5 kn movement; in other hand we didnt know where the exact location.

I mean, when you know its movement speed you must be know the exact location of that movement.

Exploration Tools: Multibeam Sonar: NOAA Office of Ocean Exploration and Research

oceanexplorer.noaa.gov

multi-beam and side scan sonars intended to scan directly below the vessel, unlike the ASW submarines, hydrographic vessels are not interested with a detection far from the source, but right in the nose of the source so refraction &reflection effects are minimal.
They will serve their purpose when they arrive at the location, at least localize the site and determine status of the submarine via ROV,inclination of the sub and etc, so that rescue can start as soon as possible.

 

[Umigami]

Seems logic, but survace vessel currently in Indonesia Navy service that can do that only Rigel & Spica.

Also as @trishna_amrta said before, 402 at a different layer: probably both Rigel & Spica hardly struggle to locate 402, especially thorugh sounding.

Now, i dint find any matches conclusion, in one hand REM has detected 2,5 kn movement; in other hand we didnt know where the exact location.

I mean, when you know its movement speed you must be know the exact location of that movement.

REM already lost that target. They even said that detection is inconclusive and can't be determined as submarine.

Just stop bringing that one, PHP banget itu...

 

[KanalKiri]

Seems logic, but survace vessel currently in Indonesia Navy service that can do that only Rigel & Spica.

Also as @trishna_amrta said before, 402 at a different layer: probably both Rigel & Spica hardly struggle to locate 402, especially thorugh sounding.

Now, i dint find any matches conclusion, in one hand REM has detected 2,5 kn movement; in other hand we didnt know where the exact location.

I mean, when you know its movement speed you must be know the exact location of that movement.

thats all came from news, we have to wait official release from dispenal. 24h more is critical situation IF sub crew still alive.

the 1 only trust statement come from kadispenal that subs predicted sunk at 700 meters depth

 

[Umigami]

https://twitter.com/i/web/status/1385079861891321862

 

[Umigami]

 

[JATOSINT]

72 HOURS!

https://twitter.com/i/web/status/1385126012996907018

 

[this is crunch]

Recent Update
- Official Press Conference has been held
- The Submarine is still not found
- The naval hydroghraphic survey vessel KRI Rigel is expected to arrive on site by tomorrow ( Friday, 23 April)
- The Singaporean MV. Swift Rescue is expected to arrive on site by 24 April
- The Malaysian aid is expected to arrive on 26 April
- Maximum depth of the sub is confirmed to be 500 meters

summarized from various sources
-correct me if im wrong-

 

[wekiweko]

I thought Indonesian water are shallows thus would be easy to find the sub.

On a serious note, if she (or what remains of her) was indeed resting at the bottom at +/- 700 meter water depth then the best way to find her is by sending a DSRV down there. AFAIK no sonars can reach that depth.

On other serious note, the need to have sub rescue vessels equipped with DSRV and stationed not just in one but in all three fleet bases is real and have to be seriously considered