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I watered the watermelon vines and the next day, my oldest watermelon had a split in it's rind 1 1/2" long. Does this mean the fruit is ruined?

Will the split keep getting bigger, and what can I do to keep it from happening to my other 4 immature watermelons?

First time gardener here, so be gentle with me!!

I am not sure how to prevent the others, but I do know that the split does not ruin the entire melon!