Two more elderly victims were found dead at the ship's meeting point.
It is unfortunately possible some of the remaining 17 missing passengers+crew are held captive in airlocks in the partially submerged ship.

The most probable cause of this accident is a navigational error. The size of the ship is not a determining factor in its ability to sink, as we know already from the times of the Titanic. An impact on a side (instead of from the front) means that watertight compartments may not be that effective. I'm curious to know how they worked anyway.

Several further questions remain unanswered:

• why did the ship choose an unusual route
• where exactly did the first impact happen
• how well was the crew trained in handling such emergencies
• why did the ship not send the distress signal
• who was really in charge of navigating the ship when the accident
  happened?

Unlike what the shipping company wants us to believe, the conditions in this accident were rather good: the sea was calm and warm (at least compared to Baltic Sea standards), the waters were shallow, there was an inhabited island close-by, help was easily obtained etc.

Having a drill is a very good thing to do and it show that the U.S. takes sea safety seriously. It is not commonplace where I live (by the Baltic Sea) where cruises typically take a little more than 24 hours and people often go on these cruises several times per year. On the other hand having your life west in the cabin is something I just can't understand. On all the Baltic ferries, the life wests are easily obtained by the rescue points. This eliminates having to struggle your way to your cabin and back in an emergency situation. I've understood that the most modern cruise liners in the Caribbean, like the Oasis of the Seas, have a similar setup, though.