1.   An international commission has named weak door locks and the weak steel construction of the bow visor as among the reasons for the tragedy.

2.   Divers have also found that two of five locks on the bow visor had never been secured, Der Spiegel said.

3.   Investigators almost immediately focused on the bow visor, a top-hinged door at the front of the ferry that allowed vehicles to drive on and off.

4.   The bow visor was secured by several locks.

5.   Insufficient locking devices and a poorly-built bow visor have been determined as the causes of the sinking, according to the international inquiry committee.

6.   Insufficient locking devices and a poorly built bow visor have been determined as the causes of the sinking, according to the international inquiry committee.

7.   According to the operator Estline, the front bow visor has not been rebuilt since the ferry was delivered.

8.   Another Estonian member of the commission, Uno Laur, said the bow visor could have been ripped off because of a construction weakness.

9.   But the outer bow door visor -- which on the Estonia was ripped off, causing the accident -- has since been permanently sealed.

10.   Experts are divided on the question of why the bow visor, the forward door, split away.