Fury from the Deep is another highly-regarded season 5 classic, but to be honest, it's a bit difficult to see why. Episode 1 certainly starts as another fun Troughton runaround, with the three of them playing in the foam on the beach (so not the most exciting thing to listen to, but it was probably all right when watching it). And then the Doctor investigates a pipe using a sonic screwdriver -- yes, it's the first appearance of the Doctor's trusty tool, here used for what it was designed to do: turn screws.
But after that, when the Doctor, Jamie, and Victoria are tranquilized and taken inside the Eurogas Base (the pipe's bringing in natural gas from the North Sea, see), things really seem to drag. Robson is the worst kind of boss, one who refuses to listen to anyone else because it might damage his arbitrary reputation. It might be acceptable if he were pitched as a more reasonable person who happens to have a hang-up over this one thing (that's certainly the way the script seems to generally portray him), but Victor Maddern pitches his performance with a baseline of nastiness and hysteria already in place, so he's unlikeable from the moment we meet him. And because he's both unreasonable and clearly in the wrong (not to mention the massive inferiority complex he seems to be nursing -- "You'd better have something more than a high flown theory, because if you haven't I'm going to take you and chop you up into little pieces and throw you back to your crummy little university," he says nastily to Harris, his second-in-command), all the scenes of people arguing with him to do the right thing drag on forever. If they'd had a sensible person in charge of this place, the story would be over by episode 2. But no, things carry on. There's a bit of fun with our heroes when they're locked up inside a room, as Jamie scrambles through a ventilation screen while Victoria simply picks the lock, but really, it's not sufficient enough to sustain interest. Nice cliffhanger though, as a foamy seaweed something tries to get into the room Victoria's currently occupying.
Episode 2's a little better. Harris's wife Maggie, who was stung by some seaweed last episode, is feeling poorly, and when two men call to look at the gas cooker, they quickly make her day go from bad to worse. This is Mr Oak and Mr Quill, and the clip of their attack, with their mouths open wide hissing gas at poor Maggie, was deemed too frightening for the Australian audience, and so this sequence exists. It's certainly creepy, as the sound of gas hissing is accompanied by a soundtrack from Dudley Simpson that prefigures his work in the early 70s. And we get some more creepiness with the seaweed as well, as it seems to move under its own power and produce a shocking amount of foam -- threatening to engulf the Harrises' patio.
But other than that, it's yet more arguing between Robson and whoever happens to be presenting the reasonable course of action at any given moment, be it Harris, Dutch observer Van Luytens, or the Doctor. Robson stubbornly refuses to listen, and that's that. And so when the impeller, the thing which pumps the gas out from the main pipeline at sea, stops working, it's treated as an inevitable consequence of Robson's inaction -- which may be true, but it's not very interesting. Still, a heartbeat can be heard coming up the shaft as well, so I suppose it's not the worst cliffhanger ever. It's just not one of the best either.