When Jarod infiltrates a criminal gang, he's initiated by being tied to a chair and dumped in the water, with the key thrown in afterward. When the gang discovers who he is, they do the same stunt without the key. The writer of this episode, Steve Mitchell, recycled this script at least three times on different shows, the others being Pacific Blue and Cobra. In all of them, the protagonist goes undercover in a thrill-seeking group, is initiated by being handcuffed to a chair and having to find the key underwater, and is eventually discovered, handcuffed to a chair again and thrown into the water without the key. I don't know whether this was just an easy script to re-use, or Mitchell liked underwater escapes.