How far below the East River surface is the L Train in NYC?

Question

Does anyone know how far underwater or underground the L Train Tunnel is (running between Brooklyn and Manhattan)? I can't seem to find this anywhere.

Answer 1

Tell me about it!  I thought I'd found some leads searching for  "14th Street tunnel" (its proper name though it has only ever been used for the L trains) but the articles were all deleted from their servers!

Maybe someone feels this is a "vulnerable" point and so they've suppressed information about it.  They don't let you take pictures in the NYC subway anymore.