Translation of "Unforgiving" in Japanese

The oceans are an unforgiving place,

海の環境は非常に厳しいからです

It is a brutally unforgiving place down there.

ここは荒々しく容赦ない地だ

And survive in the unforgiving terrain and bitter cold until then.

それまで 厳しい寒さの中で生き延びろ

In harsh environments like this one, the terrain can be unforgiving.

厳しい自然の中の 地形は容赦ない