The Blue Planet: The Deep Pearl, 9.35pm In the second part of this award-winning documentary series, strange creatures have evolved in the darkest depths of the world's oceans. Of all the ocean habitats, the deep ocean remains the least known. Sixty per cent of the Earth's surface is covered by seas more than 1.6km deep but only a handful of submarines are capable of diving that deep. In this programme we take a journey from the surface down into the abyss. A sperm whale is resting at the surface. It is about to leave a world we know well. Here is the air to breathe, the waters are warm and bathed in light, the pressure just one atmosphere. When the whale dives we follow it into an alien world. Within just 10 metres the pressure has doubled and the temperature has dropped considerably. Go below 1,000 metres and you enter the dark zone. From here downwards only animals can survive - there is no light for plants dependent on photosynthesis. This is a world of the weird and wonderful where we meet the sea squirt, sea cucumbers, velvet-bellied sharks and angler fish (above). Night Visions Pearl, 10.35pm Two short stories make up tonight's Night Visions. In the first, entitled Quiet Please, a city dweller Gerald (Cary Elwes, right), bothered by his noisy surroundings and the news reports of serial killings, goes camping. However, his pleasure is constantly disrupted by another camper, Ben (Brian Dennehy, left). But Ben may have picked the wrong stranger to try to get friendly with. In the second story, an army scientist Ben Darnell (Bill Pullman) discovers an 1800s self-contained populated prairie. He longs to join the community and lead their simple life, but the grass is always greener . . . The Oprah Winfrey Show Star World, 1pm Now and again Oprah Winfrey still manages to get guests on her show that other talk show hosts could only dream of. This afternoon her studio is graced by the comeback kid, the lovely John Travolta (above). He will be plugging his new movie, a thriller called Domestic Disturbance in which he plays a divorced father and discussing Winfrey's favourite topic - weight loss. Travolta tells why he decided to start exercising again and how his new workout routine helped him lose 9 kg. He also reveals the key to the success of his seemingly fairy-tale marriage to actress Kelly Preston and his parenting methods. Finally Travolta talks about his emotional trip to Ground Zero in New York and how the experience moved him. Also on the show, Winfrey provides an update on what is happening to the more than US$1 billion (HK$7.8 billion) that has been donated to help those whose lives were shattered by the September 11 tragedy. Viewers can see how the contributions will be distributed, and how survivors and their families - from firefighters and police officers to custodians and building employees - will be taken care of.