A submarien evaded radar?? pretty easy since it is SONAR underwater, and RADAR above water. In the details of this story just shows it is a simple lie. Just try hanging onto a ship that is moving,, the pressure wave alone will rip you off, and the sonar used, at such a close range will turn your internal body structure into jelly.
UN experts: North Korea continues to evade UN sanctions (AP)
from the article: Iran Revolutionary Guards: Unit engraved emblem on U.S. ship