system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Body organs. What’s in the space between them? Can organs leak? What holds them in place?
gpt
Held in place by fascia *(sheets of strong connective tissue sort of like ligaments / tendons, but not involving bone or muscle)*.            
Yes, they can leak. If it's your intestines leaking it's probably going to lead to a nasty infection. A leaking lung can lead to collapse of that lung. A leaking gall bladder or stomach can eat away nearby tissue.          
There isn't much space; usually the organs are against each other. Some slime to make movement easier. In the brain, both between the hemispheres and between the layers of covering, there's fluid.