Croatian Speleo Server: http://public.carnet.hr/speleo/index_en.html
Deepest and Longest (with Links to Info) http://public.carnet.hr/speleo/karta.html
Each person/permit will cost 70 Kun (singular Kuna for currency websites) ~7/8 pounds
As soon as possible: 2 months minimum time?
http://public.carnet.hr/~mgarasic/uvjetien.htm Croatian Speleo Organisation notes on applying for expedition permits
Seem very serious, lots of exploration, active and young. Website hosted on main croatian speleo server, which has lots of pages translated into English, apparently by Dalibor Paar (also their archive manager).
Dalibor Paar is also the head of the Speleo umbrella assoc.
A Solid State physicist!
Istra - initial peninsula, loads of caves. Slovene Karst esque.
Istra cave club page: http://www.sdi.hr/
Istra Info (Tourism site, with campsites + etc.): http://www.histrica.com/
Cave very near Pazin (central Istra), described (English abstract then croatian): http://public.carnet.hr/speleo/clanci/hrv/bregi.html
Velebit has a lot of caves, all national park, many deep caves (small mountain range near the sea)
We'll be mainly in the Primorski-Gorski Kotar (GORSKI KOTAR) region, possibly extending into Lika-Senj.
Within this region (3rd county along coast): http://en.wikipedia.org/wiki/Lika-Senj_County
Velebit info: http://public.carnet.hr/speleo/VIPS/eng/index.html
Velebit County web page: http://www.lickosenjska.com/index.en.php
Cave + Lake further south (Lika Senj): http://www.i-reception.net/plitvice/marko/html/barac_caves.html# http://www.i-reception.net/plitvice/marko/html/barac_caves.html# http://outdoors.webshots.com/album/89349914fFdlRk
Gorski kotar - Vražji prolaz (Devil's passage, canyon leading to cave - blog post with photos): http://rozza.blog.hr/2007/05/1622536187/gorski-kotar-vrazji-prolaz.html
Longest/Deepest Caves (GORSKI KOTAR):
Tufti: Mt Velebit:
Cave Rescue (English site): http://www.gss.hr/en/news.htm
Caving Terms Dictionary: http://public.carnet.hr/speleo/znanost/terminologija/SpeleoRjecnik.html
Google Maps Info / Campsites / Cave Locs: http://maps.google.co.uk/maps/ms?ie=UTF8&lr=lang_en%7Clang_sl&hl=en&msa=0&ll=45.213004,13.925171&spn=0.806837,1.867676&z=9&om=1&msid=115952171898335328386.000440f74754c40605a94