Conversation so far:
Regarding the band Tool, what is undertow?
Undertow is the debut studio album by American rock band Tool, released on April 6, 1993.
How did the Tool album Undertow do with the public?
As of 2010, Undertow has sold over 2.9 million copies in the United States, and is certified double platinum by the Recording Industry Association of America.
were there any hit songs on the Tool album Undertow?
The singles from the album Undertow are Sober and Prison Sex.

Question: What are some significant fact that you can tell me about the album?
Self-contained rewrite: What are some significant fact that you can tell me about the Tool album Undertow?