Okay folks, this is not good!
Owing to the first precipitation here in Perth for the past four months, a sizable quantity of water managed to, seemingly, enter the right earpiece. I am unsure as to which part, however I highly suspect that the water breached the mesh and made its way into the driver.
I would be a lot less worried if it entered the tubes (if it's even possible), for once evapoured I should imagine sound will right itself.
The sound in the right ear sounds somewhat muffled; bass especially. It is said not to power them up when wet, however something more would have happened by now if I had fried an internal component (it is either that or it happened immediately).
I have contacted Sennheiser AU/NZ via their Facebook page, awaiting reply.
The pair of IE8s I had lasted four years and got wet countless times with nary a problem!
If all else fails there might be a chance of having them replaced on warranty (in spite of water damage), nevertheless I have a bad feeling about this, but will report back.