Yoki

Yoki was the Pirate captain of an pirate crew who brought Laboon to Reverse Mountain 50 years ago from the West Blue, he shook hands with Crocus. He and his crew were looking forward to exploring the Grand Line, but were saddened they had to leave Laboon behead because of how dangerous the Grand Line is. They promised to return someday and take Laboon back with them.

Then a few years later, Crocus got disasterous news about the captain and the crew. Yoki and his crew got scared of what they had seen and endured and left the Grand Line in desperation after only going a short distance into it. They left via the Calm belt and the most obivous outcome was death for the entire crew.

The Straw Hats told Laboon that their crew may be still alives somewhere, hoping it would keep his spirit of seeing them return alive high. However it was not enough to convince the whale. If they are indeed still alive, there has been no evidence to suggest it since.