That sounds interesting, what would that mean in english?

It's actually a really nice suggestion. Níl dul as means there's no way out, idiomatically speaking. It means "There's no way out/escape but to go forward".

For some reason, a Bhreandáin, I'd prefer Níl aon dul as.... but I think that's just due to the fact that that's what I say in speech all the time (always use the aon).

Oh....Oh my, that's perfect.... Thank you everyone for your help, and thank you VERY much Breandán for giving me the perfect wording!

I will definitely vote for this one - a grand way of putting:
There is no other way but to go forward!

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

FGB gave both so I went for brevity, but I have no problem with adding aon in as well.

Níl dul as ach dul ar aghaidh.
Níl aon dul as ach dul ar aghaidh.

Await further opinions or improvements ...

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

That's nice.

I was taking the meaning too literally at first. It's not through fog or through a tunnel, it's through life.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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Nah, I think you nailed it there Bren. I'd go with this too" Níl aon dul (amach) as ach dul ar aghaidh....nice rendering.