But I just did an experiment. I cooked them specially, and found that the dead clam with its tongue sticking out could open after cooking. Some people say that this kind of food can be eaten not long after death. But I'll throw it away. Be careful next time. Maybe it's been a long time. I soaked from 8 o'clock to 4 o'clock in the morning.
I suggest you don't eat it either. It's best to eat fresh seafood.