...it could be interpreted as a message to Iran and a demonstration of strengthening ties between Egypt and Israel.It could also send a message that, "hey, a-holes, we have subs as well as nukes and missiles to deliver them."
The subs could be used to take out the radar stations so the jets can blow up the factories. They are an impressive system. They may well be placed there to keep an Iranian second strike from happening after they take out the Atomic plants.