It's pretty clear in Orthodox teaching that we know salvation can be found in the Church, but it is completely Un-Orthodox to suggest that there is no salvation outside the Orthodox Church. Anyone that teaches such a belief is a radical and is teaching something that is heterodox and foreign to our faith.
Whether you are a radical or an extreme liberal, both sides are dangerously hanging off the ladder and both are very close to teaching heterodoxy. A moderate position is the Orthodox faith. To suggest that there is no salvation outside our Church is both wrong and heterodox.
It is true that there is One, Holy Catholic & Apostolic Church, but there are multiple ways of being related to that Church, and there are many who are invisibly members of it, who may not ever be received into it on Earth.
Not only that, but there are some who have fallen asleep who still may attain salvation in the end, even though they can't be officially received into the Church anymore.
If someone is radical and tries to teach "Extra Ecclesiam nulla salus" to you, realize that it is radical and not Orthodox.
We must also keep in mind that one can certainly be a member of Christ's heavenly Church, even if they aren't a member of his earthly Church.
"Extra Ecclesiam nulla salus. All the categorical strength and point of this aphorism lies in its tautology. Outside the Church there is no salvation, because salvation is the Church" (G. Florovsky, "Sobornost: the Catholicity of the Church", in The Church of God, p. 53). Does it therefore follow that anyone who is not visibly within the Church is necessarily damned? Of course not; still less does it follow that everyone who is visibly within the Church is necessarily saved. As Augustine wisely remarked: "How many sheep there are without, how many wolves within!" (Homilies on John, 45, 12) While there is no division between a "visible" and an "invisible Church", yet there may be members of the Church who are not visibly such, but whose membership is known to God alone. If anyone is saved, he must in some sense be a member of the Church; in what sense, we cannot always say.
So when I say that there is salvation outside the Church, I'm talking about the visible, earthly Church. I'm not talking about the heavenly Church. (which are certainly united, but there are some in the heavenly Church which are unknown to us)
As I said, I would affirm the truth that there is no salvation apart from Christ & his Church. However... I don't believe one has to necessarily be a member of his Church on earth in order to attain salvation. If someone tries to say that no one can be saved without being in the earthly church, they are teaching something un-Orthodox, and they are judging the souls of other human beings. Let God be the judge...