Sourdough bread uncooked from inside
Mine takes 40 minutes for 500g flour, just under 70% hydration. That's in preheated cast iron, with the lid on (and wetted inside) at 240C for the first 20 minutes, then down to 180. The hard crust seems like too hot to long, possibly too much top heat too.
Did you let it cool (almost) fully before cutting and tasting? If I'm impatient, it seems doughy and underdone. The absolute warmest it should be when you cut it is just warm enough to soften a little butter. The inside looks OK to me - a closer crumb than you might have been aiming for but better for sandwiches. I'm prone to handling mine too much or too roughly and knocking some of the air out as I transfer it to the pan, with this effect
Next time try turning the oven down a bit when you take the water out. To avoid wasting this loaf, if it still seems underdone when cold, toast slices of it (probably leaving the crust) and eat hot with butter.