Rory Nugent's book is the more upbeat of the two as O'Hanlon's has a more negative view of the indigenous people of the area. Both are amusing in parts ,especially about meetings with witch doctors. Nugent took a photo of something but as you will see from the text he was unable to get close enough to investigate.
Extract From O'Hanlon's book
He ends his journey to Lac Tele by asking this:
p.379 " So Doubla". I asked softly"Why did Marcellin swear he saw the dinosaur?" "Don't you know?" said Doubla, giving me his first real smile." It's to bring idiots like you here. And make a lot of money"
So is it just a con? The races of the Congo refer to Mokele- Mbembe as the spirit of the forest and say it takes several forms. Some indigenous people's when questioned point to pictures of a Rhinoceros as the dinosaur and it is claimed that it is a race memory from when the jungle was once plains and the rhino roamed there. More than one investigator has pointed out the lake is quite shallow and it would have to be a small dinosaur to hide there. The water levels may rise in the rainy season of course. It is said that if there is any place that a dinosaur could still exist it would be in the Congo jungles but the jungles weren't always there and it would have been grass land plains thousands of years ago. There are still patches of this in the jungle, clearings where the animals gather (See the Channel 4 programme Congo , which is still sometimes transmitted)
So sadly it seems there may not be a living dinosaur unless it is some sort of evolved creature from the era of the dinosaurs. It would be unlikely to look like something from Jurassic Park though , probably much smaller and a changed appearance in order to adapt to the changing world around it.