Big locked door in warehouse

[Nemirae]

After defeating Titanic, I'm just exploring around the warehouse, I got Daryl's robot too..but I come across a large door where Daryl says: "This door is seriously damaged. No informatician has been able to fix it. I wonder what's on the other side though.", and then you get the option of using an Air Bomb but it doesn't do anything.
Has anyone found a way to open that door?

[Suigintou]

I think it can't be opened. I have used around 40 air bombs on it and it doesn't open