hard climbs and explosions
"Surfacing" -- that's a good way to describe it.
... Except for me it's more like I'm clawing my way up a cliff with my lower body encased in cement. Unless some external factor wakes me up quickly it usually takes a LOT of effort for me to pull myself out of a lucid dream -- even after I've started to lose the plot. Sometimes after I wake up I can't actually move my body for a minute or so. It's like I'm paralyzed.
I had one once where I felt like I exploded -- and woke up to find myself sitting upright in my bed with my heart going a million miles a minute. That was interesting...
But honestly, I'd rather not end my dreams by blowing up if I could help it. So if anyone has tips on how to make gentler transitions between lucid dreams and waking up, I'd love to hear them!