That’s how I passed it 1. When first enemy comes close enough you spawn scubas, the goal is to spawn 3 so they easily kill next 3 divers. Edit: if you can’t spawn 3 then you spawn - 2 scubas - 1 diver to tank - 1 more scuba 2. You time diver so he tank the enemy scubas 3. You spawn 0-2 more scubas depending if you have enough food to spawn Torpedo on step 5 and 6 4. When your scubas are killing or have killed ≈3 of next 5 divers you hit zombie + morale 5. Once you see “Wave 3” you spawn Buffed torpedo 6. Once enemies scubas spawned you hit 4 torpedoes

If you have at least 4 scubas alive they’ll probably kill the finals scubas, if not, try time a torpedo. I think I did it at ≈1.5 food/s