No, it shouldn't be encoded or encrypted in any way in your database.
If you look at your blogs table (wp_blogs if you are using the default prefix), you should see sentient.mmgtv.org listed in the domain column of that table. If you don't, that means that somehow the site creation/registration failed.
If you do see it listed there, then check the blog_id associated with that domain. Then, check to make sure the appropriate tables (posts, postmeta, options, terms, term_relationships, term_taxonomy, links, comments, commentmeta) all exist for that blog ID (again, if you used the default prefix of wp_, and if the blog_id of that site is 2, then those tables would have a prefix of wp_2; so your posts table for that blog would be called wp_2_posts).
Why are you searching for /limelight/sentient? What does that signify? Did you create a folder in the public_html area of your server called sentient? If so, delete it. All of the directories are handled virtually through WordPress multisite; and if a directory exists with the same name as a subdomain/subdirectory site, the real directory will take precedence over the virtual site.