In the Belly of the Beast

In the Belly of the Beast is a Trophy/ Achievement unlocked on the Zombies map Zetsubou no Shima. It requires you to 'survive being consumed'.

In order for this achievement to unlock, you must be eaten by a Thrasher, and have one of your teammates kill it before you bleed out. Alternatively, it will unlock if you bleed out while consumed, and your team survives, making you respawn in.