An extremely deadly/hostile atmosphere on a planet/moon/asteroid is being exploited (mined?) by biological avatars controlled from orbiting ships. The protagonist begins to lose the distinction between his avatar "self" and "reality".
You question reminds me of the famous story "Call Me Joe" (Astounding Science Fiction April 1957) by Poul Anderson.
Humans in a space station orbiting Jupiter remotely control artificial lifeforms on the surface of Jupiter.