That seemed like a convoluted storyline, even by CSI standards.
The Albanians dive without the dive instructors to plant fake loot on a wreck in the middle of the river and over 150 feet underwater. Then, they go back and get the dive instructors to teach them about the river they've already navigated solo, luring them with the stuff they already planted at the wreck.
Then, they plant the bomb on a pier along the shore in shallow water instead of any complicated plot that seems like it would have required that much prep work in the first place.