Alberth wrote:

Nice idea, but it does not exist.
Water is at level 0, and level -1 does not exist at all.

Before adding it, a point to ponder is whether it is worth sacrifying one or more levels of land for it. As for now I see little use for such a level in the game (ie it does not seem to bring new game playing features).
If it is just the for the nice flooding effect (which would cost a lot of new graphics and developer time, and is practically used never), I'd suggest you find a land/sea/water simulator rather than trying to become a transport tycoon.

This comment was imported from FlySpray: https://bugs.openttd.org/task/4060#comment8584

unimatrix wrote:

You could make an under-water tunnel (Channel Tunnel anyone?). The realism fans would be thrilled.
But obviously if it would mean to much work, it's not worth it. Just wanted to put the idea out there.

This comment was imported from FlySpray: https://bugs.openttd.org/task/4060#comment8586

Krille wrote:

When I saw in the code that items can be flooded I first looked for the option to raise the sea level. There is none, however you can still build at, but not below, sea level: http://wiki.openttd.org/Scenario:Flevoland

It's also possible to build underwater tunnels, you'll need this patch:
http://wiki.openttd.org/User:HackaLittleBit/Under_Water_Tunnels

This comment was imported from FlySpray: https://bugs.openttd.org/task/4060#comment8589

andythenorth wrote:

Should be closed. 0 means 0 :)

This comment was imported from FlySpray: https://bugs.openttd.org/task/4060#comment14336

andythenorth closed the ticket.

Reason for closing: Won't implement

Thanks for the suggestion. There was a non-zero sea-level patch that explored this. However it adds very little to the transport aspects of the game, and adds a lot of complexity with the terrain and handling flowing water. It's not a current goal for OpenTTD.

Flyspray clean up: more than 5 years old, and not obvious what else can be done with this, so closing. If this offends, discuss with andythenorth in irc. Thanks.

This comment was imported from FlySpray: https://bugs.openttd.org/task/4060