What does Mike Echo mean on a cruise ship?

Excuse me, could you please clarify what you mean by "Mike Echo" on a cruise ship? Is it a reference to a specific service, an event, or perhaps a person who is well-known in the cruise industry? Could it be a code name or an inside joke among passengers or crew members? I'm intrigued to understand the context and meaning behind this phrase, as it's not immediately clear to me. Could you elaborate further?