YOU SAID:

I have a hand neck deep in the reactor core

INTO JAPANESE

私は原子炉のコアの奥深くに手の首を持っています

BACK INTO ENGLISH

I have the neck of my hand deep in the core of the reactor.

INTO JAPANESE

私の手の首は原子炉のコアの奥深くにあります。

BACK INTO ENGLISH

The neck of my hand is deep within the core of the reactor.

INTO JAPANESE

私の手の首は原子炉の炉心の奥深くにあります。

BACK INTO ENGLISH

The neck of my hand is deep within the core of the reactor.