1.   It said that the submarine simply drifted off course and ran aground and that the crew and the submarine itself should have been promptly returned to the North.

2.   It insists that the submarine drifted south by accident after developing engine trouble.

3.   North Korea has insisted its submarine accidentally drifted into South Korea while on a routine training mission.

4.   North Korea has insisted that its shark-class submarine accidentally drifted into South Korea while on a routine training mission.

5.   North Korea claims the submarine also drifted southward with engine trouble during a routine training mission.

6.   The North claims that the submarine drifted into South Korea because of engine trouble, an explanation South Korea rejects.

7.   Pyongyang claimed the submarine drifted accidentally due to engine failure but Seoul and Washington have questioned that explanation.

8.   The North had claimed the submarine drifted south on a routine training mission.