"I Love The Smell Of Diesel Fuels In The Morning!"
"That smell... those diesel smells... smells like...
VICTORY!"
DBF (Diesel Boats Forever)
Following her 1942 commissioning as USS GROUPER (SS-214)
USS GROUPER as SSK-214 (Hunter-Killer conversion)
USS GROUPER (AGSS-214) serving as an
Underwater Sound Labatory sonar test platform.
Recall now that Grouper's
six
torpedo tubes forward were removed and the Forward Torpedo Room (FTR)
was simply renamed the Forward Room Compartment... a
massively large power supply and associated SONAR electronic devices were then installed in the Forward Room to support the various Underwater Sound Lab SONAR equipment under Test and Evaluation. That array aft of the sail (right over
the After Battery Compartment [ABC]) – was called "The
Colossus." One of the trick qualification questions
was how many hydrophones are mounted on the Colossus [??] – the
answer remembered is 196. Not sure why that was
important to SS qualification, except to make an unqualified new-bee
submariner fail testing on his first SS qualification attempt. When
that Colossus was lighted off... a very loud sound resonated through the boat indeed and any sleep was near
impossible in ABC where my rack was located. The Colossus sounds
like a super-amplified 100k+ flight of Yellow Jacket Bees might
sound. Another Grouper
anomaly... main ballast tank #7 (MBT-7) originally surounding the After
Torpedo Room (ATR) pressure hull was somehow closed off to sea...
that space brought inside the pressure hull with an access hatch in
the ATR deck. This new space creation inside pressure hull was used for dry
storage of food, spare parts, and general dry goods. Don't know just how the MBT-7 conversion was done in the ship yards, but
obviously the new #7 storage room was somehow configured inside
Grouper's
pressure hull as part of the AGSS conversion. This MBT-7 conversion had to be done
since whatever dry storage space formally available in the FTR was unavailable for ship's company use, the Forward Room conversion space was now
reserved exclusively for the Underwater Sound Lab gear and work/bearthing space. Grouper
simply had 4 aft torpedo tubes in the ATR. Funny, Grouper
still got the Battle E as evaluated shooting when running away.

DJ Paul, "Submarine Qualified" in December 1963 as
ship's company aboard USS GROUPER (SS/SSK/AGSS-214),
for a "Wikipedia" historical trip down memory lane, click HERE.
For another historical look at the Fleet Boat Story
(aka Pig Boats),
view some insightful writing by clicking HERE