If the police were smart enough to download the dive computers then we'd know for sure. The girl's was listed in the inventory but not sure if that was actually hers or a rental and went back to the shop, but between the instructor's, other DM's, and the recovery divers' computers we should be able to know exactly what happened without relying solely on eyewitnesses and memory.
If I'm not mistaken, in Linnea's case they gave the victim's computer to the instructor which is just mind numbingly asinine.
In Linnea's case, the dive computer was removed from the body before the coroner arrived on scene. It found its way back to the Instructor's home, where it was later shown to the NPS Investigative Services Branch investigators, much to their surprise. When the Instructor told the investigators you could not download data from Linnea's computer, they believed her and let her keep the computer. From there, it went to the dive shop's attorney and he gave it to Christian McDonald, Chief Diving Officer/Director of Diving, Small Boating, & Marine Field Research Safety Programs at Scripps Institution of Oceanography in San Diego. McDonald downloaded three dive computers for the defense lawyers: (1) Linnea's, (2) the Instructor's, and (3) the "Divemaster in Training" assisting the Instructor. Linnea's dive computer was never produced to Linnea's family or their attorneys during the litigation, although the downloads were eventually produced approximately 1 3/4 years after Linnea died.
Here is the portion of the transcript of the NPS investigators' interview with the Instructor concerning the dive computers. The numbers at the beginning of each sentence are the line numbers in the transcript:
2059 Q1: Do you have a way - do you have a way your way of getting me the data from
2060 your dive computer for that dive?
2061
2062 A: Let me see.
2063
2064 Q1: Um, and I - we’ve got thumb drives if you - if you’ve got that ability.
2065
2066 A: [The Instructor speaking to her male partner, who was present in her home during the interview] Just bring me my computer and her computer and her computer and my iPad.
2067
2068 Q: Her computer?
2069
2070 A: Yeah. I have her computer.
2071 Q: Oh, you have Linnea’s
2072 computer? Awesome.
2073
2074 Q1: Yeah, if you - if - if I can get that diagram that day, I don’t need anything else.
2075
2076 A: What I did is I took pictures of it.
2077
2078 Q1: Did you?
2079
2080 A: So, I can send the pictures to you.
2081
2082 Q: Oh cool.
2083
2084 Q1: Oh excellent, yes. That’ll work great.
2220 Q1: Which - those are wrist computers. Is that how it works?
2221
2222 A: Yes
2223
2224 Q1: Which one’s yours and which one’s hers?
2225
2226 A: This one is mine, and this one’s hers.
2227
2228 Q1: And they just work the same?
2229
2230 A: Yes. The only difference is that mine is air integrated so that I can tell how much
2231 air I have.
2232
2233 Q1: Oh, that’s cool.
2234
2235 A: Yeah, these do not.
2236
2237 Q1: And do you mind if we take a picture of hers and just the prep bag and - and
2238 I’ll have - I’ll give you - you can either text me the pictures or email them to
2239 me what - whatever’ s best for you.
2655 Q: Do you have the data- or do you have like the stuff to download hers too or do
2656 you just look...
2657
2658 A: No you just look..