Amaq (עָמַק) means to be or become deep — physically (digging a pit deep) and metaphorically (deep counsels, deep sleep, deep sin). The related noun emeq (H6010) is a valley — the geographically deep place. The adjective amoq (H6012) is "deep."
Depth in Scripture is a rich theological space. The deep things of God (emqe El) are beyond human fathoming (Job 11:8; Romans 11:33). Isaiah 29:15 condemns those who "go deep to hide their plans from the LORD" — using amaq for sinful conspiracy. But Psalm 92:5 celebrates: "How great are your works, O LORD, how profound [amaq] your thoughts!" The sea is tehom — the primordial deep — and God walks upon it. Jesus sleeping in the deep storm is the Creator resting in his creation; his rebuke of the waves the original amaq being reordered.
The noun family: emeq (valley, H6010), omq (depth, H6011), amoq (deep, H6012). Valley and depth share a root — both are the low, hidden places. Israel's great battles often took place in valleys (emeq Jezreel, Valley of Elah). The theological reversal: God who rules the heights also commands the depths. Psalm 139:8: "If I make my bed in the depths [sheol], you are there."