South Korean Ferry Disaster: What happened?

    On the night of April 15th, 2014, news quickly spread of a South Korean sinking not too far off the coast land. Nearly a week later, many questions have been answered surrounding the disaster and many questions have not been answered. Ships and shipwrecks always fascinate me, ever since I become obsessed with the Titanic, and this one sparks my interest as well. To help summarize what the case so far, I have laid out the facts and the questions about that fateful night on April 15th: 

Facts-no particular order of events.

1. The call to the traffic control center from the doomed ferry took place at 8:55 a.m. Korean time. 

2. 450 passengers, mostly high school students, were on board. 

3. Passangers could not board lifeboats because the ship began listing so severely. 

4. The death toll (as of 4/20/14) has risen to 58, with 244 missing. 

5. Nearly 100 have been rescued. 

6. The ship was near Byeongpung Island.

Questions

1. Where are the 244 missing people?

2. What exactly caused the ship to sink?

3. Why did the ship sink as fast as it did?

4. Did the captain do enough to help?