The navy frigate sent by Spain to accompany the humanitarian Global Sumud Flotilla of around fifty volunteer-crewed vessels taking aid to Gaza is unlikely to intervene to prevent any attacks by Israel on the fleet, which Israel has bombed and harassed nightly since its arrival in the Mediterranean.
You can see past flotillas, which generally did not have the crew martyred. The point isn’t for the crew to die, which they probably won’t but to show the undeniable barbarity of Israel blocking aid via first-hand documentation.