Please do a bit of homework .
If you ferment at a decent pressure which is self carbonation this will not happen .
My pressure drops about .3 of a bar or 4psi
After i cold crash .
Never in a million year's will it implode .
You will need a spunfing valve otherwise it will blow up .
Yes just hydrate your yeast and close up .
You can fire a bit of gas in to make sure you have a seal .