Hi Locke,
Thanks for your question! We had a similar question asked earlier, please take a look at the answer here:
Design area 5.5 Mechanisms to reduce noise
In short, I recommend taking a look at the photo gallery – there are photos of the crocodile monitoring boats and engines there. From there, you can do wider research to find the information you’re looking for.
Let me know if you have any follow up questions!
Thanks,
Rachel