Yep....
There have been some double fatalities due to nets and other debris on wrecks. At least that's what it looked like when the bodies were found. Whether that's a cause or effect (e.g. did they die due to entanglement, or die and THEN get entangled) is sometimes difficult to figure out.
There are also records of several double-fatalities where one diver goes into a wreck while the other "stands by", the first gets in trouble, the second goes in to rescue the first and neither come out again.
All I'm pointing out Doc is that the solo/buddy decision is not nearly as simple as it first appears. I dive solo all the time - either intentionally and literally alone, or intentionally and effectively alone. If I'm shooting video or stills I am almost always effectively solo. Ditto for spearfishing. Just about the only time I'm not is when I'm just doing a "fun dive" somewhere.
I'd estimate that of my last 100 dives, probably 70-80 of them have been either completely or constructively solo for one of these reasons.
For example when my g/f and her daughter certified, I dove at the same time as the class. While I was in their proximity, I was effectively solo diving; I had no buddy with me.
IF you're going to solo dive, you have a lot of thinking to do first. If you haven't done the thinking, you almost certainly shouldn't be doing the solo diving.