His plan was to leave Norway with a support crew in a raft, make a stop in Iceland, then swim to the USA. Why the swimming rest stop in Iceland? That's where the Opera Browser CEO's mother lives. He was going to stop for a cup of hot chocolate.
The "plan" to swim the Atlantic ocean came to an end when the support crew's raft suffered a puncture, and the Opera CEO, Tetzchner, was forced to rescue his support crew.
Yes, this was just a publicity stunt, it was fun to read about it. You can read more about the "swim attempt" in the Opera Software Press Release section.

