"The Core" has an interesting premise and a great scene in which an inventor is offered a check for $50 billion to get a craft that can travel to Earth's core built in 3 months. But when the ship runs into a huge crystal-lined "cavern" in the deep mantle, the plausibility meter hits zero.If you think such a trip is completely impossible, think again. Read about the "modest proposal" of Prof David Stevenson (a kiwi) from Caltech (https://www.wired.com/2003/05/prof-plans-probe-of-earths-core/).