Also, consider if "crack" here is a verb or noun. If it's a noun, maybe the portable crack is the device itself.
Alternatively, if it's cyber-related, the portable crack is a USB stick used to hack into a network's security (link). portable crack atas link
Make sure to include some Indonesian elements if possible, maybe setting in Jakarta port, and use "atas dek link" as the specific type of chain used. The term "atas dek" might refer to the chain above the ship's deck, securing containers. Also, consider if "crack" here is a verb or noun