Although I think there should also be a time marker which tells how much time left till the shipwreck ends, because sometimes it ends abruptly when you are about to collect the last packages.
I had this thought before, but I'm lazy enough to suggest it. It's better if the shipwreck will be visible in event times. Example: Shipwreck is ready to be collected.Shipwreck (time xx:xx)Shipwreck will have stayed for 45 minutes until all packages are collected, and it will be back an hour later.