Bar: fully or partially submerged mound of sand, gravel or other unconsolidated material built on the sea-bottom in shallow water by waves and currents.

UNESCO: L O S S A R Y

Based on available data, the tsunami warning center said there is "no destructive threat" to Hawaii, though it warned that some coastal areas could experience larger waves and strong currents.

CNN: STORY HIGHLIGHTS

After 41 hours and 49 minutes in the water, Nyad's handlers gave her the bad news: Because of high waves and strong currents, she was so far off course that completing the swim would be impossible.

CNN: Nyad delays attempt to break distance-swim record

We need to sense the currents and ride the waves.

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But the robot sailed through equatorial waters without a hitch despite fears that strong currents and a lack of waves would take Papa Mau off course.

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