乗客はほとんどいなかった

there were hardly any passengers

→ 乗客
phrase Rare #38,378
there were hardly any passengers ほとんどいなかった means that almost none were present or existed; いなかった is used for people and other living things.
JA: 無事だった乗客はほとんどいなかった。
EN: There were hardly any passengers who were unharmed.

その事故では怪我をした乗客はほとんどいなかった。

Few passengers were injured in the accident.

不幸にも、その大惨事で生き残った乗客はほとんどいなかった。

Unfortunately, few passengers survived the disaster.

無事だった乗客はほとんどいなかった。

There were hardly any passengers who were unharmed.