What happens inside our brain in last 30 seconds before death?

In the last 30 seconds before death, the brain experiences a surge of activity, possibly due to a flood of neurotransmitters as it tries to make sense of the impending demise. Memories, emotions, and sensations may flash rapidly, creating a surreal and intense final experience. Eventually, as oxygen levels plummet and neurons cease firing, consciousness fades into oblivion.