Revealed: How BBC's Blue Planet II used a camera with SUCTION CUPS to stick onto a mighty sperm whale and show its intimate family relationship to the world br Whale life is complex and they live across world's oceans, roving 50 miles a day br Finding and staying with a sperm whale family team's biggest challenge br With the help of an expert they were able to use cameras with suction cups br The team said they were 'hardly ready for what they saw' when footage came br br advc4245 fkghj45 br br Read more: br Follow us: @MailOnline on Twitter | DailyMail on Facebook