literally just had this, did a TON of exploring and built the seamoth, found the degari island base, the gun, and the sunbeam was about arrive... until...

Agreed. I even sent a message to the developers asking them where to send to... no response. I guess they don't really want our feedback... :(

story time:
I was looking at wikis,multiple biomes,and died so many times to find the moon pool fragments,and one day,I went to the grand reef,and explored one of the big wreks there.it took me so long to lazer cut the doors,but I eventualy got all of the moon pool fragments (had to keep returnin' for my seamoth for air).I went to scan the last fragment,and I took a wrong turn in the wreck.with 23 seconds of oxygen left.I eventualy drowned,and I was freaking out,and my heart was racing.I thought I would be ok,because I got all the moon pool fragments scanned,so I figured "I could go back to get my sea moth after I make the moon pool".The game fucking crashed,and I hadnt saved the game after a long time.I opend it up,and I was days behind,no fragments scanned (I also found a thermoreactor,I mad at that to),and I had fixed an energy problem at my base,right before the game crashed.I rage quite and didnt play for a week.

i got the same message and now i can't play on my file anymore D;

OMG..I suddenly crash today too !! Already 5 time !