Apparatus of the Brachemoth (5E)

From publisher blurb:

A 5th Edition Mini-Dungeon adventure for 4 Characters Level 5

Crouching over the port city of Octomere, poised to smash its walls and topple its towers, a barnacle-encrusted titan has been looming for nearly a week. When the bizarre construct, known as the Apparatus of the Brachemoth, arrived almost a week ago, a thunderous voice boomed out promising “vengeance”. Now it sits silently in the mouth of Octomere Harbor; it could ruin the city’s sea trade. The city needs a band of brave adventurers to enter it, confront its mysterious masters, and pilot the colossal vehicle back out to sea.