Hypothetical: What if the water disappeared from the deepest places on Earth?

Hello! I'm writing a story about large bodies of water rising off of the ground and into the air - this leads to exploration of deep places on Earth that we previously couldn't get to and I'm wondering if any experts here can speak to what would be some hypothetical effects of water being removed from the equation in some of the deepest places on our planet?

Do underwater hot springs become volcanoes?
Do structures that were otherwise being held together by pressure crumble?
What are some things that immediately come to mind that would help you to be immersed in a fictional world where such a thing had happened?

Thank you for your expertise and for entertaining this thought experiment!