An expansion of the sound pioneered on their previous release Mosquito Control, this EP offers a slight evolution toward the direction Isis would begin to take with their first full length, Celestial.

The three songs which make up the original EP (tracks 1–3) are tied together with spoken word samples from the short-lived television series Hotel Room (specifically, the third episode, entitled "Blackout").

The song "Ochre" contains a sample from the film Dead Man by Jim Jarmusch, and is a reading of a portion of William Blake's poem "Auguries of Innocence".

This is the first release with Jay Randall (Agoraphobic Nosebleed) on electronics and backing vocals (he also appeared on Isis' cover of "Streetcleaner", originally by Godflesh).

Aaron Turner has expressed a degree of dissatisfaction with the final product, stating that Isis were “wrestling with a number of different ideas”, and that he personally “was trying to force a level of technicality in some of the guitar parts, especially in 'The Minus Times', which ended up detracting from the overall power of the songs.”[1] He has, however, shown fondness for the title track, and posited that despite “whatever shortcomings this record has, it’s one of the darkest things we ever recorded in terms of atmosphere, production and composition.”[1] In reviewing the album, Allmusic's William York stated that The Red Sea “shows off a few different facets of the band's hardcore/doom/sludge/metal style, which at this stage was already pretty impressive despite not yet having fully developed to the point it would on subsequent efforts.”[2] He continues to say that although it “feels a little bit more like them 'doing their homework' than a later album like Celestial does, it still outshines the work of many of their peers.”[2] All tracks are written by Isis, except "Hand of Doom", a cover of a Black Sabbath track from 1970's Paranoid