Crush the cookies into fine crumbs, then mix with the melted butter. Press the mixture firmly into the bottom of a springform pan and refrigerate for 30 minutes.
Melt the dark chocolate in a double boiler or using the microwave, and let it cool slightly.
Soak the gelatin sheets in cold water for 5 minutes. Squeeze out the excess water and dissolve the gelatin in the warmed orange juice. Allow to cool slightly.
Whip the heavy cream until stiff peaks form. Gradually add the sugar and orange zest, continuing to whip until just combined.
Gently fold the melted chocolate into the whipped cream mixture, then carefully fold in the gelatin-orange juice mixture.
Pour the chocolate-orange mousse over the prepared cookie crust, and smooth the top. Refrigerate for at least 4 hours, or preferably overnight, to set.
Before serving, garnish the cake with milk chocolate shavings and additional orange zest.
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