What happens if someone stays in a black hole after it collapses?

 You couldn't "stay" inside a black hole even if you tried. Past the event horizon, space and time swap roles—the singularity is no longer a physical place, but a moment in your future.

To understand why, it helps to clarify that a black hole itself does not collapse. It is the aftermath of a collapse—specifically, the gravitational collapse of a massive star. Outside a black hole, you can move freely through space, but you are forced to move forward in time. Once you cross the event horizon, the boundary beyond which nothing can escape, those rules invert. Just as you cannot stop yourself from reaching tomorrow, you cannot stop yourself from reaching the singularity.

Long before you arrive at that final moment, you experience a lethal phenomenon known as spaghettification. Because the gravitational pull increases sharply over short distances, the gravity acting on your feet is significantly stronger than the pull on your head.

An astronaut is stretched vertically and compressed horizontally by intense tidal forces while falling into a black hole. Source: Wikimedia Commons.

These intense tidal forces stretch you vertically and squeeze you horizontally, tearing apart your body, your cells, and eventually your atoms into a stream of subatomic particles.

Your journey ends at the singularity, where the original mass of the collapsed star is crushed into a region of infinite density. At this extreme threshold, the laws of general relativity break down. Physicists theorize that your fundamental particles and quantum information are added to the total mass of the black hole, locking your matter away until the black hole evaporates via Hawking radiation over trillions of years.

Why don’t skyscrapers collapse in on themselves due to their immense weight?

This is the Burj Khalifa - It doesn’t crush itself. But the enemy isn’t weight; it’s wind. You can predict gravity. Men pour concrete and attach heavy steel to take weight straight down - But you can’t predict wind. It’ll bend your steel - To combat wind and hold the sky, they made a buttressed core.

Three thick wings form a chunky Y - a buttress. It’ll hold the center.

If the wind blows hard from the sea, two wings hold fast, and one wing leans into the wind - It’ll take the heft down solid concrete walls and into a thick mat. But under that, long piles hold onto desert sand.

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They don’t rest onto rock. They use friction from deep earth - this holds the 500,000 tons. The structure stands. It sheds the weight. The earth takes it all.