[Bug] Undersea tunnel appears!

[Rednaxela]

Hello everyone, I am a Hong Kong player have years of experience on simutrans but a new comer here.
Recently I have upgraded my programme from V 102.0 to 102.2.1 then 102.2.2
But I find a bug in both 102.2.1 and 102.2.2 as shown below, the trains and electric cable in the undersea tunnel appears! (Not in underground mode)

I have restore the pak to the original pak (pak128) (no addon is added), the problem still occurs!
I don't know if anyone else have solve the problem, if it does, please tell me what to do.
Many thanks to all of your kind help!! 

[prissi]

This is a know problem with the depreciate method of the under sea tunnel. Using the correct approach enforced by the current nightlies (aka digging under the sea ground) it will not be displayed.

[gauthier]

You can find help about undersea tunnels here
=> http://www.simutrans-france.fr.nf/doku.php?id=en:tunnel

[Rednaxela]

Problem solved! Many thanks!!=]