There are no other options; there is no alternative method (essentially the same meaning as '他に方法がない').
検査の結果が悪く、他に方法はないと医者に告げられた。
The doctor told me the test results were bad and that there was no other option.
今回のトラブルは深刻で、他に方法はないため再起不能だった。
This trouble was serious and, with no other option, it could not be restored.
交渉はすべて失敗に終わり、他に方法はないと彼は嘆いた。
All negotiations failed, and he lamented that there was no other way.