Under water WSN is little bit difficult to simulate. I dont think codes are available readily. You have to develop the codes according to your constraints like at what depth and in waht symmetry you are going to place, what type of sensor, what you want to measure and all these differ for each application. So what application you have in mind you formulate and then try to code in MATLAB.

Dear Mamun

Thank you very much for your support

Check this website, they have Matlab codes for WSN (also papers and pptx). I hope this may help.

http://www.njavaid.com/downloads.aspx

Good luck

Can anyone download the following paper for me?

Research Directions for the Internet of Things

Helpful

http://slideplayer.us/

For the paper "Research Directions for the Internet of Things", you can Google it on Google scholar (first link, [PDF] in the right of the page).

http://scholar.google.com/scholar?q=Research+Directions+for+the+Internet+of+Things&hl=fr&as_sdt=0&as_vis=1&oi=scholart&sa=X&ei=0ncIVLTpG43SaLq0gpAO&ved=0CBwQgQMwAA

Good luck

Dear Khalid Thanks a lot!

you're welcome