Weird holes, help

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Hi! This is my friend’s sourdough bread, she told me she sliced it when it is still hot. Does any one know what happened?

Thanks !

Hi! I think this crumb shows signs of being underproofed as it has a really  dense crumb at the bottom and large openings on top. Also slicing while hot tends to lead to a gummy texture as steam is released too quickly from the bread. After baking there is still a lot of changes in the crumb being made as the bread cools. It’s generally recommended to wait at least 4-5 hours until the bread has completely cooled or longer if you have the patience. Hope I gave some good tips for the next try!