I also read recently that people who are truly drowning cannot speak, because their body shuts the epiglottis so that water cannot enter the lungs, that this is actually what leads to drowning (the people asphyxiate, pass out in the water, the epiglottis opens up and then the lungs fill with water).
I don’t know much about this, so don’t take my word for it.
Research it to be sure.
I also read recently that people who are truly drowning cannot speak