Episode Title:The Challenge.Episode Description:The Sealab team meet Alex, an archaeologist who has dedicated the last 7 years to finding the sunken ship Viking, which sank over 100 years ago. It is rumored that the ship was carrying some Aztec treasures. Alex's brother Chuck is very excited by the discovery, and his excitement is getting in the way. Sealab follows rules and guidelines that guarantee safety, but prevent Chuck from finding the treasure faster. Alex is willing to cut his losses if lives could be lost, but Chuck will not let the last 7 years of his brother's life be for nothing.