20 good Piranhas trained to infiltrate megalodon and eat it from inside.
Lmao..This is sort of a real life scenario. Entering through the mouth should take the piranhas directly to the stomach and they'll need to swim in the Megalodon's stomach juice which should be acidic enough to kill them before they do any major damage xD
OT: Probably like a thousand? And that's from the outside? No no...The skin should be very difficult to break through....
Maybe a 100,000?
No no...same outcome. If they aren't breaking through the skin..I don't know tbh >.<