New PO Chrono question

[RJK]

Hi guys,

I'm not new to watches, but I am new to Omega. The recent buzz about the LM PO chronograph really caught my attention and I'm trying to learn more about the model and brand.

Inspite of all the reading and research I've done so far, I'm unable to find answers to two questions:

1. Are the chronograph pusher operable underwater? I heard previous PO's were, but can't find info anywhere about the new version. I'd assume yes, but those pushers look like they have screw-in collars.

2. For Ti version, is the Grade 5 Ti treated in someway to increase it's hardness/resistance to scratches. In my experience, Ti scratches sooo much easier than 316 or 904 SS. A finely finished (mirror polished in some areas) Ti would be a scratch magnet, I'd imagine. No?

I'd appreciate any help.

Thanks guys, Ji