Immersion follows the electro-rock/drum 'n' bass band's previous albums - 2005's Hold Your Colour and 2008's In Silico - which both peaked at number two.
They finished in front of Michael Bublé, who re-entered the charts following his performance on ITV1's An Audience with... show, jumping an impressive 19 spots. Glee's third volume of The Music and The House, Katie Melua's first studio album in three years, debuted in third and fourth place respectively.
Elsewhere, the Rolling Stones's brief triumph with re-release Exile On Main Street ended as it slid four places to number five. Alicia Keys leaped two places to move ahead of Plan B and Lady GaGa, who both slipped from last week.
Meanwhile, Faithless held onto a top ten place, after plummeting to ninth spot, while Florence and the Machine stuck in tenth position. The Baseballs, Keane and AC/DC all dropped out of the top ten, landing at 11, 16 and 17 respectively.
The top ten albums in full (click where possible for our reviews):
1 (-) Pendulum: 'Immersion'
2 (19) Michael Bublé: 'Crazy Love'
3 (-) 'Glee': 'The Music Vol 3 Showstoppers'
4 (-) Katie Melua: 'The House'
5 (1) Rolling Stones: 'Exile On Main Street'
6 (8) Alicia Keys: 'The Element Of Freedom'
7 (3) Plan B: 'The Defamation Of Strickland Banks'
8 (5) Lady GaGa: 'The Fame Monster'
9 (2) Faithless: 'The Dance'
10 (10) Florence and the Machine: 'Lungs'
Source: Official Charts Company
> Click here for this week's singles chart