The federal government is set to announce its first major investment in sea mines in more than half a century.

Defence will spend up to $1 billion on high-tech underwater weapons, including self-contained explosive devices.

It's in a bid to bolster Australia's defence strategies following last month's $2 billion investment on Ute missiles for the Top End.

China recently acquired more than 100,000 sea mines as part of its recent military expansion.

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