# Submarine Attack

If you want to make your helicopter compatible with the submarine attack activity, you need to set up a weapons system and set the following local variables:

### Lvars to set

<table data-header-hidden data-full-width="false"><thead><tr><th width="326.79998779296875">LVar</th><th>Description</th></tr></thead><tbody><tr><td><strong>MMH_COMPATIBILITY_SUBMARINE_ATTACK</strong></td><td>Always set to 1</td></tr><tr><td><strong>MMH_MISSILES_SHOT</strong></td><td>Set to 1 when a missile has been shot</td></tr><tr><td><strong>MMH_TORPEDO_SHOT</strong></td><td>Set to 1 when a torpedo has been shot</td></tr></tbody></table>


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