I want to freeze myself when I die but I want to put some bitcoins in a seed wallet written on titanium plates and hide it somewhere so I can retrieve it in 100 years or so when I am unfrozen. I was thinking of encasing the plates in a chunk of concrete and hiding it next to a reef I am familiar with in the Bahamas. Any other ideas of places to hide them so you could be sure you could get them after you are unfrozen?