How,where, what happened with the Chilazon catching by the Israelites of the exodus? It was not near the medditeranean. And which Chilazon Techelet would you recomend, Radzin or Murex?

They must have brought tchelet with them from the many and vast spoils from Egypt, and apparently made the mishkan from those materials which they had at their disposal. Mainly Radziner and some Breslov Chassidim who use the Radzin opinion of tchelet (cuttlefish), so if you are not that type of chassid and you wish to use tchelet, almost everyone prefers the murex. If you’d like to learn more, visit the “Ptil Ttchelet” website.