It was a great idea of the Tunnelling system. But the feature probably should have been thought more about the implementation of the feature. As when you look at fields. Maybe you should have done a 2 field system like Surface fields and underground fields. If you were looking at restricting build of the tunnel system. As with this you could have possibly made other new buildings like : underground warehouses to store a % of the player's res supply that can't be stolen from attack's. As this could have been away for those who constantly come under attack from Hostile's to where they would have res to continue on with instead of going to VM because of the attack's.

Sorry for the confusion by mis representation of thread title. So it has been renamed to your suggestion Dschibait. The problem with the tunnel system is let's say as we are all aware the fastest flight time is 5 min's in Sirius. So for instant you would need a level 55 Tunnel system at least to get it to 5 mins dig in or out. Which really takes a lot of fields to achieve. So I was suggesting that there was 2 type's of fields, one surface field's where all the building's existing now except Tunnel System use up. While the second is type of field is underground field's in which the Tunnel system uses up field's from this type. And so would the underground Warehouses. To save lettering space on the interface use a colour code for the different fields. Say yellow= Surface field's , orange = Underground field's. It's more of an idea to extending the feature of the Tunnel system except about the Underground Warehouses which is a new concept.

Plus the introduction of underground warehouses to store resource's that can't be attacked by hostile raid's from other player's. Considering I have seen you mention on several occasions the problem some player's are having with constant attacks to where they can't achieve to get a head so they hide in VM. The underground warehouse idea would allow them to develop a way of making sure a small portion of the res supply is kept from being taken in attacks on the planet.

With the underground Warehouses you could possibly make it where the movement of resources between the normal warehouses and the underground warehouses has to be manually done by the player. But for the player to have use of the resource's they have to be with in the normal resource supply. So the player would need to have the resource space there to be able to transfer it.

What could possibly make the Tunnel System more viable is say a Spacial Disruption Cannon similar set up as the particle cannon except it disrupts the space in front of the attacking fleet to increase it's time it take's for it to reach the planet. This could make the tunnel system a more viable tactic to endeavour upon. As being able to increase the hostile's attack time could possibly make it to where you could dig out your defence's in time for the attack. By utilising both tactic's.