Script to download annoying Navy Alarm Sounds

I needed some annoying alarm sounds on my computer to use as alarm clock sounds. I found this site to have some really annoying alarm sounds.

For some reason wget -r -l 2 will not download .wav files... no idea why...

So I had to write a script around it:

$ cat foo.sh
#! /bin/bash

# Get the page
wget http://policeinterceptor.com/navysounds.htm -O navysounds.html 

# Parse out the wav URLs
cat navysounds.html  |grep wav| sed "s/.*http:\/\///g" | sed "s/\".*//g" > wav_list

## do something to get audio url

for i in `cat wav_list`;
do
	echo $i
	wget $i
done

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So why will "wget -r" NOT download .wav files??