Stam a kasha - how come we still can't find the sambatyon if we have Google Earth etc?
I can't remember where I saw this - I think it may have been a Shl"a - but when Avraham sent Hagar away it says וַיִּפְקַח אֱלֹהִים אֶת עֵינֶיהָ וַתֵּרֶא בְּאֵר מָיִם. Not that Hashem created a well on that spot, but that He "opened her eyes and she saw it". So the Shal"a says that the well was there all along; but it was in a different plane of existence (so to speak), and when the time came, it became visible to the person who needed it. He continues to say that that may be why we don't know where the Sambatyon is, even though there are so many travelers these days. It may well be somewhere where people have walked past countless of times; but until the time is right for the people on the other side to come back it may not be seen physically.