Baptized for the dead

Baptized for the dead, what does it mean?


1 Corinthians 15


29 Otherwise what shall they do that are baptized for the dead, if the dead rise not again at all? Why are they then baptized for them?


I think it means that some are martyred for the faith:


Mark 10 38 And Jesus said to them: You know not what you ask. Can you drink of the chalice that I drink of: or be baptized with the baptism wherewith I am baptized?


What do you think?


Sincerely,


De Maria