In Star Trek Beyond, we find out that the USS Franklin is
A century old lost ship, and some of it's crew has become the main antagonists via alien technology. In the movie, we see old clips of the ships log, including one where shuttles or drop ships arrive. But many people online are saying that most of the (likely <50 complement*) crew died in a crash? I assumed that while some may have died in the crash, the majority lived (based on the ships log) at first and then their numbers dwindled for various reasons, or even that Krall killed some in using the Life Extending Technology.
What exactly happened to the crew? How did they die? And how many were there?
*Note: The NX-01 Enterprise had 83 standard crew complement, and the Franklin is similar in shape, but 2/3rds the size according to this comment.