Accidents do happen and we must accept that even when we take all precautions, even if we are healthy and fit, even if we have the latest technology to assist us, sometimes it is beyond our control. The same goes for search and rescue efforts. Sometimes, we will never know what happened, no matter how extensive the search is.
I lost my uncle at sea. He was an avid swimmer and didn't realize that being in your 60s is not the same as being in your 20s. He was on holiday, swimming on a popular beach with my aunt on an Aegean island. One moment later and he was gone, my aunt lost sight of him. Searches were carried out to no avail. His body was found several days later washed ashore a rocky island many miles away. We were lucky that his body was found. At least we knew what happened to him.
I can imagine the pain and helplessness that Albert's family feels right now but the most likely scenario is that Albert had an accident and there was no way to save him in time.