I don't think that the Titanic can be compared to the salvation or condemnation of mankind.
If Jesus was the only vessel of God's grace to ever appear it would only go to show that the purpose of God was placed in incompetent hands, since Jesus has no opportunity to save everyone personally. He lived a finite life on earth and had finite opportunity.
If Jesus was the ONLY way, then this means Jesus personally failed.
If you mean that the grace of God is the only way, then there is no personal failure.
When Abdu'l Baha visited North America, he had travelled from the port of Haifa to Alexandria, then from Alexandria to Southhampton.
There he had been provided with tickets for the Titanic's sailing. He thanked those responsible joyously but turned the tickets in for less ostentatious travel abord the RMS Cedric (also owned by White Star Lines).
Shortly after his arrival in New York he spoke to the assembled Baha`i's and said this:
"Today I have been speaking from dawn until now, yet because of love, fellowship and desire to be with you, I have come here to speak again briefly. Within the last few days a terrible event has happened in the world, an event saddening to every heart and grieving every spirit. I refer to the Titanic disaster, in which many of our fellow human beings were drowned, a number of beautiful souls passed beyond this earthly life. Although such an event is indeed regrettable, we must realize that everything which happens is due to some wisdom and that nothing happens without a reason. Therein is a mystery; but whatever the reason and mystery, it was a 47 very sad occurrence, one which brought tears to many eyes and distress to many souls. I was greatly affected by this disaster. Some of those who were lost voyaged on the Cedric with us as far as Naples and afterward sailed upon the other ship. When I think of them, I am very sad indeed. But when I consider this calamity in another aspect, I am consoled by the realization that the worlds of God are infinite; that though they were deprived of this existence, they have other opportunities in the life beyond, even as Christ has said, "In my Father's house are many mansions." They were called away from the temporary and transferred to the eternal; they abandoned this material existence and entered the portals of the spiritual world. Foregoing the pleasures and comforts of the earthly, they now partake of a joy and happiness far more abiding and real, for they have hastened to the Kingdom of God. The mercy of God is infinite, and it is our duty to remember these departed souls in our prayers and supplications that they may draw nearer and nearer to the Source itself."
(Abdu'l-Baha, The Promulgation of Universal Peace, p. 47)
Regards,
Scott