I once met a man who had been a similar experience; he was a firefighter in the 9/11 attacks. He had been up in one of the towers while it collapsed, and was buried for over three days. Here's what I remember him describing it as:
It's dark. Pitch black. You can't see anything, nothing can see you. There are no sounds, only silence; and if there are any, ...
Provided that you cannot come up with what your character could feel and think, you have several options to get some fresh ideas.
Check records from actual events
Check the records of earthquake survivors.
Check the records of newscasts from rescue operations of people being trapped in caves, or under debris.
Read how other authors have dealt ...
Well, I'd translate into familiar terms, just like the original translator:
Is the unit 'sežanj' really a fathom? Or just approximately the same measure?
I doubt the "galley of the Doge" is a Croatian thing; the Doge is an elected Lord in Italy; a galley is a sailing ship -- I don't get the reference at all, but I doubt this simile is what was in ...
Defying gravity, perhaps. Immune to gravity.
Suspended, without support.
Weightless in the air.
As general advice, use more words; use metaphors and similes; readers do not mind reading.
She's three feet above the ground, cruising along beside me.
Also, recognize that both characters and the reader will grow accustomed to a character that is routinely flying,...
Remember that very little of what our senses experience actually reaches our consciousness. (Consider for example the famous basketball selective attention test or the Baader-Meinhof effect.) What we consciously notice is more about who we are and what is important to us, than it is about what is found in the world around us.
One character will see the ...
Sensory doesn't have to be exclusive:
A rich sensory experience doesn't need to be specific to a single location. It just needs to create a vivid experience. If you want to show poverty, the smell of garbage paints as fine a picture as a detailed description of peasant clothes. Describe the things you CAN describe, like the lapping of waves against a shore, ...
Research. Read non-fiction. Watch Videos. Seek and find Nature documentaries.
Do not copy the journals of others: Generalize them.
What are they smelling? The flowers, the animals, the manure? What are they seeing? What are they feeling on their skin? Look it up. Is Hawaii humid? Is is windy, what is the average wind speed in July? The average temperature in ...