Blair and his cousin embark on an adventurous day out, snorkelling on the wreck of the Omeo, but their excitement turns to panic when Blair loses his brother's cherished GoPro camera on the seabed.

No one knows about his mistake except his cousin, and she urges Blair to keep it a secret. But Blair's lies quickly spiral out of control. Terrified to confess but wracked with guilt, Blair is left floundering in the deep.