YOU SAID:

the drone needs to be in water to run

INTO JAPANESE

無人機は水の中にいなければならない

BACK INTO ENGLISH

Unmanned aircraft must be in the water

INTO JAPANESE

無人航空機は水中になければならない

BACK INTO ENGLISH

Unmanned aerial vehicles must be underwater

INTO JAPANESE

無人航空機は水中でなければならない

BACK INTO ENGLISH

Unmanned aerial vehicles must be underwater