Okay, I have ONE question that's been bothering me for a while, they have the 3D maneuver gear, yet they never considered to use it whenever they are eaten BY a Titan to get back into its mouth and slash the hell out of the back of the Titan's throat? I mean REALLY! It would make the most of sense, Does ANYONE agree with me on this, also if they had a long and sharp enough sword and were eaten, they could easily kill it from inside the Titans mouth, but to be honest, Maybe they are just too scared to really DO anything when eaten, Tell me your reason why they don't do this and if you agree with me.

they wouldnt have the momentum to be able to cut the throat once inside
and its anime

3D maneuver gear, it has the capability to go into Titan's skin(and flesh) and stone, i'm quite certain they could use it to escape.

Soldiers can't use their 3D maneuver gear in the titan's body due to its hot temperature inside, it would just melt the sharp edges of the sword of the 3D maneuver gear. Also you can get paralyzed for a moment due to shock that's why soldiers can't cut the titan's body inside.

The initial shock of getting caught in a titan's mouth is more than enough for a soldier to forget everything out of fear. They get bitten almost immediately after, anyway.

If your being eaten you won't be like oh ok lots cut the throat you'll be like ahhhhhh I'm gonna die