There seems to be a lot of confusion about what's implied and what's known. I think I've IDed an accurate timeline:
19:00 - Madsen and journalist depart for a trial run for a story that she's writing.
22:30 - Madsen claims he dropped the journalist off at this time, at a restaurant at the North end of the island.
02:30 - Journalist's husband reports her missing.
02:50 - Repeated attempts to reach the sub via radio are unsuccessful.
03:40 - Sub is reported missing by the police.
07:00 - General alarm set for Baltic, instructing all vessels to look for the sub.
10:15 - Sub spotted by Harbor Master in Koge Bay, South of where it was meant to be. Harbor Master talks to Madsen who claims he hadn't been in contact due to technical issues but is heading for harbor.
11:00 - Passing vessel sees the sub with Madsen on the tower. Madsen disappears below deck, then returns to the tower and the sub begins to sink. In 30 seconds, it's completely submerged and Madsen is rescued. Madsen tells the rescuers that he was the only passenger.
17:45 - After interviewing the journalist's family and Madsen, Madsen is placed under arrest for the death of the journalist. Madsen maintains that he dropped her off near a restaurant at 22:30 the previous day.
It's indicated that the location where Madsen claimed to drop her off is blanketed with security cameras (whose footage the police have). The sub has been raised and will be inspected shortly. This isn't at all a case of "he panicked when the sub sank", there's a nearly 12-hour gap in his known location and even if you believe his story, the journalist that he dropped off at a restaurant hasn't been seen in a few days now.
19:00 - Madsen and journalist depart for a trial run for a story that she's writing.
22:30 - Madsen claims he dropped the journalist off at this time, at a restaurant at the North end of the island.
02:30 - Journalist's husband reports her missing.
02:50 - Repeated attempts to reach the sub via radio are unsuccessful.
03:40 - Sub is reported missing by the police.
07:00 - General alarm set for Baltic, instructing all vessels to look for the sub.
10:15 - Sub spotted by Harbor Master in Koge Bay, South of where it was meant to be. Harbor Master talks to Madsen who claims he hadn't been in contact due to technical issues but is heading for harbor.
11:00 - Passing vessel sees the sub with Madsen on the tower. Madsen disappears below deck, then returns to the tower and the sub begins to sink. In 30 seconds, it's completely submerged and Madsen is rescued. Madsen tells the rescuers that he was the only passenger.
17:45 - After interviewing the journalist's family and Madsen, Madsen is placed under arrest for the death of the journalist. Madsen maintains that he dropped her off near a restaurant at 22:30 the previous day.
It's indicated that the location where Madsen claimed to drop her off is blanketed with security cameras (whose footage the police have). The sub has been raised and will be inspected shortly. This isn't at all a case of "he panicked when the sub sank", there's a nearly 12-hour gap in his known location and even if you believe his story, the journalist that he dropped off at a restaurant hasn't been seen in a few days now.