Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode | Airdate | Game 1 | Game 2 | Game 3 | Viewers |
| --- | --- | --- | --- | --- | --- |
| 1 | 17 April 2010 | 'Twin Peaks' | 'A Walk In The Dark' | 'Lock And Key' | 4.52m |
| 2 | 24 April 2010 | 'Caught In The Net' | 'Stick 'Em Up' | 'Power Trip' | 4.41m |
| 3 | 1 May 2010 | 'Knotting Hills' | 'It's A Wrap!' | 'Lock And Key' | 4.31m |
| 4 | 8 May 2010 | 'Caught In The Net' | 'A Walk In The Dark' | 'Power Trip' | 4.44m |
| 5 | 15 May 2010 | 'Twin Peaks' | 'It's A Wrap!' | 'Lock And Key' | 4.46m |
| 6 | 22 May 2010 | 'Knotting Hills' | 'Stick 'Em Up' | 'Power Trip' | Under 2.61m |
| 7 | 29 May 2010 | 'Caught In The Net' | 'A Walk In The Dark' | 'Lock And Key' | 4.68m |
| 8 | 5 June 2010 | 'Knotting Hills' | 'Stick 'Em Up' | 'Lock And Key' | 3.44m |
Question:
what was the air date of the first episode?
Answer:
17 April 2010