Agree it was an excellent series - think it was certainly better than 2 & 3. We watched it on SBS On Demand before it hit FTA but eked it out at an episode each couple of days.Just finished The Bridge season 4 from SBS. Brilliant. Excellent cast all round. Saga played by Sofia Helin is simply fabulous.
Another series that is similar and that we thoroughly enjoyed was Trapped, also on SBS On Demand. It's set in Iceland.