Hello @Cody Morgan,
Welcome to Atlassian Community!
Bamboo can be installed completely offline as it doesn't depend on the internet to work. Though it will require access to the Database and Remote Agents, I assume these will be part of your internal network.
By going "offline" (no internet), you may lose some ability to install plugins/apps and also have certain health checks validated such as the CVE (vulnerability) self-checker.
Please check the Bamboo installation guide and good luck!
Kind regards,
Eduardo Alvarenga
Atlassian Support APAC
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