The media gathered throughout Mission Day At Sea formed an imagery of ripples surrounding the Undine Silica. This is perhaps what the hidden message, "vestige in the waters", from Courier Ultimatum was referring to. The ripples has evolved into new messages on during the Perpetua Hexathlon.
。Decrypting the Latin letters from the media may have led to the unlocking of this Tessera. : UNDA TEMPUS INVENIO UNDINE
→ How could this be further interpreted? : Ripples, in time, reveal the undine.
。The Devanagari in the ripples decrypts to the following:
Mind sculptor and wise man banished serpent
Find music to bloom the lotus