I found this one a lot of fun.  Peter Davison goes a long way to encourage this audio's silly state.  It's hard not to love a fun little adventure tinkering with the TARDIS' chameleon circuit.  I'd love for more stories to explore this idea a little more, so I'm happy to see it even in a short story like The Deep.  Plus, I found it pretty cool and creative.  The TARDIS turns into a whale!  How can anyone hate this story?