Read they are searching an area where an oil slick was spotted. Said oil could be from ruptured fuel tank or the crew could have dumped the fuel to decrease weight and surface the sub.

MY QUESTION: WILL FUEL OIL ON A SUB MAKE IT MORE BUOYANT OR LESS?

They probably blew the fuel out with pressurized air to gain buoyancy.
Doesn’t sound good for the crew of that boat.

They think the submarine is lying well below crush depth.

They changed location of sub and this new location depth is 184 to 385 feet.
If they dump fuel oil (with compressed air) the sub buoyancy will be more positive. But this compress air is also used to blow ballast tanks water to surface and keep the ship on level keel. Don't want to use it all up. Great Depth will rapidly use up compressed air to surface. Its a German made diesel electric. Don't know what the oil slick means but wish the best.

Another reason why I picked working on Aircraft Carriers.

Update on information.



Or below?

Maybe they dumped it to make an oil slick so someone can find them.

Looks like they went to crush depth and imploded the vessel.
Found it on the bottom in three pieces by DSRV in 2600 ft. water depth.
No survivors.
May they RIP.

Man, that would be a terrible way to go. RIP

I served on two WWII diesel electric boats (USS Diodon and USS Charr) and my prayers go out to the crew and their family members.

Sad news. Wonder if they'll attempt to raise it to determine the cause or leave it as a grave? Pretty deep for a salvage but not technically impossible - purely expensive.

Bad deal.

I had read where there was suspicion that the Chinese might have sunk it.

RIP

Was the Indonesian sub one of our old diesel electric boats, or was it purchased from another country?

Just my curious .02,
LeonCarr

I believe russian from the 70s retrofitted by south korea

Gotcha

I'd read it was German built. Commissioned and bought by the Indonesian Navy back in the '80's.

correct


The German-built submarine, which has been in service in Indonesia since 1981, was rehearsing for a missile-firing exercise that was to take place on Thursday. Tjahjanto and other military leaders were to attend.https://news.yahoo.com/indonesian-military-says-submarine-missing-113530997.html

RIP brothers of the dolphins.

I qualified in submarines January 1975.

I qualified in '62; what boat(s) did you serve on?

Scorpion and Thresher era!
I qualified 3 Steurgeon class fast attacks in the 1970’s.