When icebergs break apart owing to increased temperatures, they often tilt and release part of their underwater structure and thus provide some insight into their inner parts. Here the former waterline of the iceberg is clearly visible.
<a href="//commons.wikimedia.org/wiki/User:AWeith" title="User:AWeith">Andreas Weith</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>