2nd hand subs is that really bad??? 
Look at this thread where our old Challanger boat penetrate the USN
CVN grp:
http://www.militaryphotos.net/forums/showthread.php?t=49408&page=2
and I quote:
Originally posted by signatory in
militaryposts.net
The Swedish success in the Baltic sea, North sea and especially the
big mediterranian exercise (Sweden had 100% win, 0 losses in 'Death
match' engagements by and against sea and air forces. With the sub
HMS Halland of Gotland class) did make the Americans interested but
it wasn't until a Singaporian
Swedish-trained, and equipped with a Swedish sub (altho actually
not of Gotland class) penetrated the defense of a U.S CVN that the
bells really rang over there... for the first time, a submarine
stood ready to fire its torpedoes against a US nuclear aircraft
carrier.
Originally posted by IAF in
militaryposts.net:
Hi signatory, this is interesting... Are you refering to
ex-sjoormens? Would you be kind enough to elaborate?
Originally posted by signatory in
militaryposts.net:
yeah.. unfortunately I don't know which
one of the subs from 'Project Riken' took part in that exercise but
yes ex-sjöormen class. Of course project Riken ment 6 years of
upgrades with the last of the 4 subs delivered in 2001. Training of
crews, engineers and sharing of documentation were also part of
that project.
Since we dunno how much the 4 Challenger class boats cost but I
am sure quite cheap( jsut look at the cost of 2 Västergötland ), it
is good platform for us to learn and gain experience for submarines
operation, just look at above example , is it more than worth
it!!!!
If the Challenger could penetrate USN CVN grp, it certainly could
do so against any navy in the world!!! Afterall who is better than
USN!!!!
Next the 2 upgraded AIP Västergötland-class submarines only cost us
USD128mils, which mean only USD64mils per boats!!!! 
Do you know how much one brand new AIP SSK cost???
It is abt USD350~400mils per boat , more toward
USD400mils!!!!
Do you know that MY bought 2 non-AIP Scorpene plus one old Agosta
given to them free cost them????
USD972mils!!!!

That is why I said you dunno what the hell you are talking abt!!!!
