British open-water swimmer Adam Walker received some surprise help after spotting a shark during his 16-mile swim in New Zealand's Cook Strait.
A pod of dolphins, seen in the video above, surrounded Walker and reportedly stayed with him for about an hour until the shark left.
Walker posted about the incident on Facebook and Twitter:
@Maghielse a pod of dolphins appeared after 3 hours, 10 mins later looked down saw a shark underneath not sure 100 percent what type it was.— Ocean Walker (@AdamsOceans7) April 29, 2014
Walker went on to finish the swim in a time of eight hours and 36 minutes. Walker has now completed six of seven swims as part of the Oceans Seven mission, which is a group of seven swimmers looking to complete seven of the world's most daunting swims.
Walker hopes to complete his final swim in the Irish Sea this August.