In regard to the Ghadir, I have found this film made 12 years ago.......it appears to be legitimate. Made by the Iranian military. Running time is a little over 8 minutes.
They are notoriously hard to spot via sonar thanks to their small size, small sonar signature and their ability to hide amongst underwater rocky outcrops.
More information :
Iran’s Mini-Subs Turn the Strait of Hormuz Into a Sonar Trap (Modern Engineering Marvels - April 9, 2026)