all cruise lines extensively search everything and you are required to be away from your bags for extended periods of time during boarding. most cruise lines also explicitly ban things like all cybersecurity equipment (flippers were particularly looked for, they seemingly consider this anything not obviously personal use electronic) power strips etc.

Royal caribbean got my friend pulled into security and questioned for hours for a RPI, and they permitted it but held it locked away separately until you deboard at the end of trip (theres ''you cannot board at all with this item, figure it out or throw it away'' and theres ''we hold it until end of voyage'')

you usually spend 4+ hours away until you see your bag again at boarding time - you might board in morning and don't get access to your room/bag until 1-4pm