[Constantine XI Palaeologus]

Never mind, I just read in another post that the missile hit the stern. Maybe that's why the damage was not as bad as it could've been.

[Dark Skies]

Also, the Saar-5 is equipped with sophisticated detection radar and countermeasures that may have created a semi-effective diversion for the silkworm.

I would imagine a big part of the shock of the Israeli Navy is that the Saar-5 systems didn't completely detect and deflect an incoming missile. Additionally, the Saar-5 has a stealthy radar signature that was obviously not stealthy enough.