The premise here is two brothers who can't find anything on Oak Island have some insights to offer other treasure hunters? Who thought that was a good idea? Unless those insights are "save your money" it's difficult to see what the Laginas bring to the table.
Each episode presents a treasure hunt in the US. The intro voice over promises a worldwide scipe, but in three seasons the world has consisted of Arizona and Florida.
Occasionally an episode is on a professional salvage effort, but mostly it's amateurs with a story about as believable as Oak Island. As you might expect, the professionals find something (minor) during the course of the show while the amateurs find nothing but more "clues" to the "mystery".
The Lagina Brothers are the draw here, but rarely do they appear in the episode beyond being an audience for some cockamamie treasure story and a recap of the failure to find anything at the end. Instead, we're treated to Matty Blake, the obsequious lap dog mascot from the Curse of Oak Island show. He's hard to watch, if only because he brings literally nothing to the proceedings. It would have been much better to field a geologist or archeologist or established treasure hunter or even just someone you'd like to have a beer with.
The major failing of the show beyond Matty is that the amateurs never find anything. Each episode with them ends on a preposterous note: it's going to rain, it's getting dark, we need a bigger shovel. All problems readily solved the next day. But no, the episode ends. This is an insulting plot device to hide the fact the audience has been duped and the treasure story was fabricated nonsense from the outset.
Three stars for a couple episodes where we learn of actual salvage efforts. No stars for the amateur stories and for Matty Blake. Three stars.