A note on spaghettification: For very large black holes, of which TON 618 is certainly one, you can actually pass the event horizon and may not even know it. This is because gravity works according to the square of the distance to a mass, as such:

F = G( (m1*m2)/r^2 )

Where F is the force on an object, G is the gravitational constant, m1 and m2 are the masses in question (you and TON 618) and r is the distance between. So, the event horizon will be very far from the singularity and when you cross it say feet-first, the difference in force between your feet and your head will be minimal until you get much closer to the singularity.

From what I understand about it though, at the point you're inside the event horizon, collision with the singularity becomes inevitable. But could you move into a slowly decaying orbit near light speed and watch the rest of the universe go cold as TON 618 eventually evaporates and sets you free? I don't think we really know.