[quote=@ZAVAZggg]
<Snipped quote by Sep>

Ah, okay.
[/quote]

[youtube]https://www.youtube.com/watch?v=bXuaCaLmtX8[/youtube]

You'll see that some of them continue onward, still having energy. I always figured it was a kind of 'kamikazee'. They're explosive on impact, but the sheer volume of them some tear through the hull, the ones behind it continue the path and so on and so forth until they carve their way through the ship. Once through the other side they loop around and go again.