1. Because the doors are designed to withstand a grenade attack
2. Because you think it's a sensible idea to have an axe in the main cabin?
1. Small arms/projectiles, I doubt very much 'grenade attack' is a design case.
2. Yes, there is. Obviously not going to detail where.
Edit: Few posters got there before me. In any case, I don't think the press conference stated whether a fire axe could be heard being used.