Exam Question
Q2
Describe the process and preparation as per the classification society requirements for in-water survey of the underwater structure of a very large vessel.
Class 2 (2nd Engineer)
SC&S
📅 Mar 2026
Reference Answer
### 1. Introduction and Applicability
An In-Water Survey (IWS) is a method of surveying the underwater parts of a vessel while it is afloat, serving as an alternative to a traditional dry-docking survey. It is conducted by an approved diving company under the direct supervision of a Classification Society Surveyor.
**Applicability as per Class Rules:**
* **Frequency:** IWS may be permitted in lieu of one of the two mandatory bottom surveys required within a 5-year Special Survey cycle. A vessel must be dry-docked at least twice in any 5-year period. Two consecutive IWS are generally not permitted.
An In-Water Survey (IWS) is a method of surveying the underwater parts of a vessel while it is afloat, serving as an alternative to a traditional dry-docking survey. It is conducted by an approved diving company under the direct supervision of a Classification Society Surveyor.
**Applicability as per Class Rules:**
* **Frequency:** IWS may be permitted in lieu of one of the two mandatory bottom surveys required within a 5-year Special Survey cycle. A vessel must be dry-docked at least twice in any 5-year period. Two consecutive IWS are generally not permitted.
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