NAT not working

This is probably something simple, but I am stuck, not a firewall expert.

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I have, in my network, a firewall and behind it a network that doesn't interact with our main network save for a few IP. The topology is this:

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(Inside Network 192.168.173.0/24 GW int 173.1 ) - [Mal-ASA] - Outside Int IP (192.168.66.10/24) the 192.168.66.0 is also an internal network behind a firewall that goes to the isp, the topology is:

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[Mal-ASA] - Outside Int IP (192.168.66.10/24) trunk to L2 network switch to (Inside int 192.168.66.1) [ASA-Out] (public IP)

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I am trying to NAT on the internal Mal-ASA from 192.168.173.5 to 192.168.66.12 on the outside interface of the Mal-ASA. For some reason it is completely unreachable and I am not seeing why. The ACL both ways are ip any any for now.

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Thanks for any help.